<PAGE>

                                                                    EXHIBIT 99.1

                             LETTER OF TRANSMITTAL

                       TO EXCHANGE ALL OF THE OUTSTANDING
                          9 1/2% SENIOR NOTES DUE 2009

                                      FOR

                          9 1/2% SENIOR NOTES DUE 2009
                  REGISTERED UNDER THE SECURITIES ACT OF 1933,

                                       OF

                              STEEL DYNAMICS, INC.

        THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME,
        ON OCTOBER [--], 2002 (THE "EXPIRATION DATE") UNLESS EXTENDED BY
                              STEEL DYNAMICS, INC.

                           FIFTH THIRD BANK, INDIANA

<Table>
<S>                                                 <C>
         By Registered or Certified Mail:                      By Hand or Overnight Courier:
             Fifth Third Bank, Indiana                           Fifth Third Bank, Indiana
 Attn: George L. Bawcum, Corporate Trust Services                Corporate Trust Services
       251 North Illinois Street, Suite 310            Attn: Computershare Trust Company of New York
            Indianapolis, Indiana 46204                              Wall Street Plaza
                                                                      88 Pine Street
                                                                 New York, New York 10005
</Table>

                                 By Facsimile:

                                 (317) 383-2992
                        (For Eligible Institutions Only)

                                 By Telephone:

                                 (317) 383-2710

     Delivery of this letter of transmittal to an address other than as set
forth above or transmission via a facsimile transmission to a number other than
as set forth above will not constitute a valid delivery.

     The undersigned acknowledges receipt of the Prospectus dated September
[--], 2002 (the "Prospectus") of Steel Dynamics, Inc. (the "Company"), and this
Letter of Transmittal (the "Letter of Transmittal"), which together describe the
Company's offer (the "Exchange Offer") to exchange $1,000 in principal amount of
its 9 1/2% Notes due 2009 that have been registered under the Securities Act of
1933, as amended (the "Registered Notes") for each $1,000 in principal amount of
outstanding 9 1/2% Notes due 2009 (the "Old Notes"). The terms of the Registered
Notes are identical in all material respects (including principal amount,
interest rate and maturity) to the terms of the Old Notes for which they may be
exchanged pursuant to the Exchange Offer, except that the Registered Notes are
freely transferable by holders thereof (except as provided herein or in the
Prospectus) and are not subject to any covenant regarding registration under the
Securities Act of 1933, as amended (the "Securities Act").

     The undersigned has checked the appropriate boxes below and signed this
Letter of Transmittal to indicate the action the undersigned desires to take
with respect to the Exchange Offer.

     PLEASE READ THE ENTIRE LETTER OF TRANSMITTAL AND THE PROSPECTUS CAREFULLY
BEFORE CHECKING ANY BOX BELOW. YOUR BANK OR BROKER CAN ASSIST YOU IN COMPLETING
THIS FORM. THE INSTRUCTIONS INCLUDED WITH THIS LETTER OF TRANSMITTAL MUST BE
FOLLOWED. QUESTIONS AND REQUESTS FOR ASSISTANCE OR FOR ADDITIONAL COPIES OF THE
PROSPECTUS AND THIS LETTER OF TRANSMITTAL MAY BE DIRECTED TO THE EXCHANGE AGENT.
<PAGE>

     List below the Old Notes to which this Letter of Transmittal relates. If
the space provided below is inadequate, the certificate numbers and principal
amounts should be listed on a separate signed schedule affixed hereto.

<Table>
<Caption>
-----------------------------------------------------------------------------------------------------------------------
                                               DESCRIPTION OF OLD NOTES
-----------------------------------------------------------------------------------------------------------------------
                                                                        AGGREGATE PRINCIPAL
           NAME(S) AND ADDRESSES                   CERTIFICATE           AMOUNT REPRESENTED           PRINCIPAL
          OF REGISTERED HOLDER(S)                   NUMBER(S)              BY OLD NOTES*          AMOUNT TENDERED**
-----------------------------------------------------------------------------------------------------------------------
<S>                                          <C>                      <C>                      <C>
                                                                                  $                        $
-----------------------------------------------------------------------------------------------------------------------
                                                                                  $                        $
-----------------------------------------------------------------------------------------------------------------------
                                                                                  $                        $
-----------------------------------------------------------------------------------------------------------------------
 * Need not be completed by book-entry holders.
** Unless otherwise indicated, the holder will be deemed to have tendered the full aggregate principal amount
represented by such Old Notes.
  See Instruction 2.
-----------------------------------------------------------------------------------------------------------------------
</Table>

     This Letter of Transmittal is to be used either if certificates
representing Old Notes are to be forwarded herewith or if delivery of Old Notes
is to be made by book-entry transfer to an account maintained by the Exchange
Agent at the Depository Trust Company (the "Book-Entry Transfer Facility"),
pursuant to the procedures set forth in the Prospectus under the caption "The
Exchange Offer -- Procedures for Tendering." Delivery of documents to the
Book-Entry Transfer Facility does not constitute delivery to the Exchange Agent.

     Holders whose Old Notes are not immediately available or who cannot deliver
their Old Notes and all other documents required hereby to the Exchange Agent on
or prior to the Expiration Date must tender their Old Notes according to the
guaranteed delivery procedures set forth in the Prospectus under the caption
"The Exchange Offer -- Procedures for Tendering."

[ ]  CHECK HERE IF TENDERED OLD NOTES ARE BEING DELIVERED BY BOOK-ENTRY TRANSFER
     MADE TO AN ACCOUNT MAINTAINED BY THE EXCHANGE AGENT WITH THE BOOK-ENTRY
     TRANSFER FACILITY AND COMPLETE THE FOLLOWING:

    Name of Tendering Institution(s)
    ----------------------------------------------------------------------------

    The Depository Trust Company Account Number
    -----------------------------------------------------------------------

    Transaction Code Number
    ----------------------------------------------------------------------------

[ ]  CHECK HERE IF TENDERED OLD NOTES ARE BEING DELIVERED PURSUANT TO A NOTICE
     OF GUARANTEED DELIVERY AND COMPLETE THE FOLLOWING:

    Name of Registered Holder(s)
    ----------------------------------------------------------------------------

    Name of Eligible Institution that Guaranteed Delivery
    -------------------------------------------------------------------

    Date of Execution of Notice of Guaranteed Delivery
    ---------------------------------------------------------------------

    IF DELIVERED BY BOOK-ENTRY TRANSFER
    ----------------------------------------------------------------------------

    Account Number
    ----------------------------------------------------------------------------

[ ]  CHECK HERE IF YOU ARE A BROKER-DEALER AND WISH TO RECEIVE ADDITIONAL COPIES
     OF THE PROSPECTUS AND COPIES OF ANY AMENDMENTS OR SUPPLEMENTS THERETO:

    Name
    ----------------------------------------------------------------------------

    Address
    ----------------------------------------------------------------------------

    ----------------------------------------------------------------------------

    ----------------------------------------------------------------------------

     If the undersigned is not a broker-dealer, the undersigned represents that
it is not engaged in, and does not intend to engage in, a distribution of
Registered Notes. If the undersigned is a broker-dealer that will receive
Registered Notes for

                                        2
<PAGE>

its own account in exchange for Old Notes that were acquired as result of
market-making activities or other trading activities (other than Old Notes
acquired directly from the Company), it acknowledges that it will deliver a
prospectus in connection with any resale of such Registered Notes; however, by
so acknowledging and by delivering a prospectus, the undersigned will not be
deemed to admit that it is an "underwriter" within the meaning of the Securities
Act. Any holder who is an "affiliate" of the Company or who has an arrangement
or understanding with respect to the distribution of the Registered Notes to be
acquired pursuant to the Exchange Offer, or any broker-dealer who purchased Old
Notes from the Company to resell pursuant to Rule 144A under the Securities Act
or any other available exemption under the Securities Act must comply with the
registration and prospectus delivery requirements under the Securities Act.

              PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY

Ladies and Gentlemen:

     1.  Upon the terms and subject to the conditions of the Exchange Offer, the
undersigned hereby tenders to the Company the aggregate principal amount at
maturity of Old Notes indicated above. Subject to, and effective upon, the
acceptance for exchange of the Old Notes tendered hereby, the undersigned hereby
sells, assigns and transfers to, or upon the order of, the Company all right,
title and interest in and to such Old Notes as are being tendered hereby.

     2.  The undersigned hereby represents and warrants that the undersigned has
full power and authority to tender, sell, assign and transfer the Old Notes
tendered hereby and that the Company will acquire good and unencumbered title
thereto, free and clear of all liens, restrictions, charges and encumbrances and
not subject to any adverse claim when the same are accepted by the Company. The
undersigned hereby further represents that any Registered Notes acquired in
exchange for Old Notes tendered hereby will have been acquired in the ordinary
course of business of the person receiving such Registered Notes, whether or not
such person is the undersigned, that neither the holder of such Old Notes nor
any such other person is engaging in or intends to engage in a distribution of
such Registered Notes, and that neither the holder of such Old Notes nor any
such other person is an "affiliate," as defined in Rule 405 under the Securities
Act of 1933, as amended (the "Securities Act"), of the Company.

     3.  The undersigned also acknowledges that the Exchange Offer is being made
in reliance on an interpretation, made to third parties, by the staff of the
Securities and Exchange Commission (the "SEC") that the Registered Notes issued
in exchange for the Old Notes pursuant to the Exchange Offer may be offered for
resale, resold and otherwise transferred by holders thereof (other than any such
holder that is an "affiliate" of the Company within the meaning of Rule 405
under the Securities Act), without compliance with the registration and
prospectus delivery provisions of the Securities Act, provided that such
Registered Notes are acquired in the ordinary course of such holders' business,
such holders are not engaging in and do not intend to engage in the distribution
of such Registered Notes and such holders have no arrangements with any person
to participate in the distribution of such Registered Notes. If the undersigned
is not a broker-dealer, the undersigned represents that it is not engaged in,
and does not intend to engage in, a distribution of Registered Notes. If the
undersigned is a broker-dealer that will receive Registered Notes for its own
account in exchange for Old Notes that were acquired as a result of
market-making activities or other trading activities, it acknowledges that it
will deliver a prospectus meeting the requirements of the Securities Act in
connection with any resales of such Registered Notes. However, by so
acknowledging and by delivering a prospectus, the undersigned will not be deemed
to admit that it is an "underwriter" within the meaning of the Securities Act.

     4.  The undersigned will, upon request, execute and deliver any additional
documents deemed by the Company to be necessary or desirable to complete the
sale, assignment and transfer of the Old Notes tendered hereby. All authority
conferred or agreed to be conferred in this Letter and every obligation of the
undersigned hereunder shall be binding upon the successors, assigns, heirs,
executors, administrators, trustees in bankruptcy and legal representatives of
the undersigned and shall not be affected by, and shall survive, the death or
incapacity of the undersigned. This tender may be withdrawn only in accordance
with the procedures set forth in the Prospectus under the caption "The Exchange
Offer -- Withdrawal Rights." See Instruction 9.

     5.  Unless otherwise indicated in the box entitled "Special Issuance
Instructions" below, please issue the Registered Notes (and, if applicable,
substitute certificates representing Old Notes for any Old Notes not exchanged)
in the name of the undersigned or, in the case of a book-entry delivery of Old
Notes, please credit the account indicated above maintained at the Book-Entry
Transfer Facility. Similarly, unless otherwise indicated under the box entitled
"Special

                                        3
<PAGE>

Delivery Instructions" below, please send the Registered Notes (and, if
applicable, substitute certificates representing Old Notes for any Old Notes not
exchanged) to the undersigned at the address shown above in the box entitled
"Description of Old Notes."

     THE UNDERSIGNED ACKNOWLEDGES THAT THE EXCHANGE OFFER IS SUBJECT TO THE MORE
DETAILED TERMS SET FORTH IN THE PROSPECTUS AND, IN CASE OF ANY CONFLICT BETWEEN
THE TERMS OF THE PROSPECTUS AND THIS LETTER, THE TERMS OF THE PROSPECTUS SHALL
PREVAIL.

     THE UNDERSIGNED, BY COMPLETING THE BOX ENTITLED "DESCRIPTION OF OLD NOTES"
ABOVE AND SIGNING THIS LETTER, WILL BE DEEMED TO HAVE TENDERED THE OLD NOTES AS
SET FORTH IN SUCH BOX ABOVE.

                                        4
<PAGE>

          ------------------------------------------------------------

                         SPECIAL ISSUANCE INSTRUCTIONS

        To be completed ONLY if certificates for old notes not exchanged
   and/or Exchange Notes are to be issued in the name of someone other than
   the person or persons whose signature(s) appear(s) on this letter below,
   or if old notes delivered by book-entry transfer which are not accepted
   for exchange are to be returned by credit to an account maintained at the
   Book-Entry Transfer Facility other than the account indicated above.

   Issue Exchange Notes and/or Old Notes to:

   Name(s)*
   ------------------------------------------------
                                  (PLEASE TYPE OR PRINT)

   Name(s)*
   ------------------------------------------------
                                  (PLEASE TYPE OR PRINT)

   Address:
   --------------------------------------------------

          ------------------------------------------------------------

          ------------------------------------------------------------

   * (Such person(s) must properly complete a Substitute Form W-9, a Form
     W-8BEN, a Form W-8ECI, or a Form W-8IMY)

        Credit unchanged Old Notes delivered by book-entry transfer to the
   Book-Entry Transfer Facility account set forth below.

          ------------------------------------------------------------
                          BOOK-ENTRY TRANSFER FACILITY
                         ACCOUNT NUMBER, IF APPLICABLE)

          ------------------------------------------------------------
          ------------------------------------------------------------

                         SPECIAL DELIVERY INSTRUCTIONS

        To be completed ONLY if certificates for old notes not exchanged
   and/or Exchange Notes are to be sent to someone other than the person or
   persons whose signature(s) appear(s) on this letter below or to such
   person or persons at an address other than shown in the box entitled
   "Description of Old Notes" on this letter above.

   Mail Exchange Notes and/or Old Notes to:

   Name(s)*
   ------------------------------------------------
                                  (PLEASE TYPE OR PRINT)

   Name(s)*
   ------------------------------------------------
                                  (PLEASE TYPE OR PRINT)

   Address:
   --------------------------------------------------

          ------------------------------------------------------------

          ------------------------------------------------------------

   * (Such person(s) must properly complete a Substitute Form W-9, a Form
     W-8BEN, a Form W-8ECI, or a Form W-8IMY)

          ------------------------------------------------------------

                                        5
<PAGE>

                 PLEASE READ THIS ENTIRE LETTER OF TRANSMITTAL
                   CAREFULLY BEFORE COMPLETING ANY BOX ABOVE.

                                PLEASE SIGN HERE
                   (TO BE COMPLETED BY ALL TENDERING HOLDERS)

X
------------------------------------------------------      --------------------

X
------------------------------------------------------      --------------------

X
------------------------------------------------------      --------------------
          SIGNATURE(S) OF OWNER                               DATE

AREA CODE AND TELEPHONE NUMBER: (-------)        -------------------------------

     If a holder is tendering any Old Notes, this Letter must be signed by the
registered holder(s) as the name(s) appear(s) on the certificate(s) for the Old
Notes or by any person(s) authorized to become registered holder(s) by
endorsements and documents transmitted herewith. If signature is by a trustee,
executor, administrator, guardian, officer or other person acting in a fiduciary
or representative capacity, please set forth full title. See Instruction 3.

NAME(S):
--------------------------------------------------------------------------------

CAPACITY:
--------------------------------------------------------------------------------

ADDRESS:
--------------------------------------------------------------------------------

                              SIGNATURE GUARANTEE
                         (if required by Instruction 3)

Signature(s) Guaranteed by an Eligible Institution:

--------------------------------------------------------------------------------
                             (AUTHORIZED SIGNATURE)

--------------------------------------------------------------------------------
                                    (TITLE)

--------------------------------------------------------------------------------
                                (NAME AND FIRM)

                                  INSTRUCTIONS

     1.  DELIVERY OF THIS LETTER AND NOTES, GUARANTEED DELIVERY PROCEDURES.
This Letter is to be completed by holders of Old Notes either if certificates
are to be forwarded herewith or if tenders are to be made pursuant to the
procedures for delivery by book-entry transfer set forth in the Prospectus under
the caption "The Exchange Offer -- Book-Entry Transfer." Certificates for all
physically tendered Old Notes, or Book-Entry Confirmation, as the case may be,
as well as a properly completed and duly executed Letter (or manually signed
facsimile thereof), with any required signature guarantees, and any other
documents required by this Letter, must be received by the Exchange Agent at the
address set forth herein on or prior to the Expiration Date, or the tendering
holder must comply with the guaranteed delivery procedures set forth below. Old
Notes tendered hereby must be in denominations or principal amount at maturity
of $1,000 or any integral multiple thereof.
                                        6
<PAGE>

     Noteholders whose certificates for Old Notes are not immediately available
or who cannot deliver their certificates and any other required documents to the
Exchange Agent on or prior to the Expiration Date, or who cannot complete the
procedure for book-entry transfer on a timely basis, may tender their Old Notes
pursuant to the guaranteed delivery procedures set forth in the Prospectus under
the caption "The Exchange Offer -- Guaranteed Delivery Procedures." Pursuant to
such procedures, (i) such tender must be made through an Eligible Institution
(as defined below), (ii) on or prior to 5:00 p.m., New York City time, on the
Expiration Date, the Exchange Agent must receive from such Eligible Institution
a properly completed and duly executed Letter (or a facsimile thereof) and
Notice of Guaranteed Delivery, substantially in the form provided by the Company
(by facsimile transmission, mail or hand delivery), setting forth the name and
address of the holder of Old Notes and the amount of Old Notes tendered, stating
that the tender is being made thereby and guaranteeing that within three trading
days after the date of execution of the Notice of Guaranteed Delivery, the
certificates for all physically tendered Old Notes in proper form for transfer,
or a Book-Entry Confirmation, as the case may be, and any other documents
required by this Letter will be deposited by the Eligible Institution with the
Exchange Agent, and (iii) the certificates for all physically tendered Old
Notes, in proper form for transfer, or Book-Entry Confirmation, as the case may
be, and all other documents required by this Letter, must be received by the
Exchange Agent within three trading days after the date of execution of the
Notice of Guaranteed Delivery.

     The method of delivery of this Letter, the Old Notes and all other required
documents is at the election and risk of the tendering holders, but the delivery
will be deemed made only when actually received or confirmed by the Exchange
Agent. Instead of delivery by mail it is recommended that holders use an
overnight or hand delivery service. In all cases, sufficient time should be
allowed to assure delivery to the Exchange Agent prior to 5:00 p.m., New York
City time, on the Expiration Date. No Letter of Transmittal or Old Notes should
be sent to the Company.

     See "The Exchange Offer" section in the Prospectus.

     2.  PARTIAL TENDERS.  If less than all of the Old Notes evidenced by a
submitted certificate are to be tendered, the tendering holder(s) should fill in
the aggregate principal amount at maturity of Old Notes to be tendered in the
box above entitled "Description of Old Notes" under "Principal Amount Tendered."
A reissued certificate representing the balance of nontendered Old Notes of a
tendering holder who physically delivered Old Notes will be sent to such
tendering holder, unless otherwise provided in the appropriate box on this
Letter, promptly after the Expiration Date. All of the Old Notes delivered to
the Exchange Agent will be deemed to have been tendered unless otherwise
indicated.

     3.  SIGNATURES ON THIS LETTER, BOND POWERS AND ENDORSEMENTS, GUARANTEE OF
SIGNATURES.  If this Letter is signed by the registered holder of the Old Notes
tendered hereby, the signature must correspond exactly with the name as written
on the face of the certificates without any change whatsoever.

     If any tendered Old Notes are owned of record by two or more joint owners,
all such owners must sign this Letter.

     If any tendered Old Notes are registered in different names on several
certificates, it will be necessary to complete, sign and submit as many separate
copies of this Letter as there are different registrations of certificates.

     When this Letter is signed by the registered holder or holders of the Old
Notes specified herein and tendered hereby, no endorsements of certificates or
separate bond powers are required. If, however, the Registered Notes are to be
issued, or any untendered Old Notes are to be reissued, to a person other than
the registered holder, then endorsements of any certificates transmitted hereby
or separate bond powers are required. Signatures on such certificate(s) or bond
powers must be guaranteed by an Eligible Institution.

     If this Letter is signed by a person other than the registered holder or
holders of any certificate(s) specified herein, such certificates must be
endorsed or accompanied by appropriate bond powers, in either case signed
exactly as the name or names of the registered holder or holders appear(s) on
the certificate(s) and signatures on such certificates(s) or bond powers must be
guaranteed by an Eligible Institution.

     If this Letter or any certificates or bond powers are signed by trustees,
executors, administrators, guardians, attorneys-in-fact, officers of
corporations or others acting in a fiduciary or representative capacity, such
persons should so indicate when signing, and, unless waived by the Company,
proper evidence satisfactory to the Company of their authority to so act must be
submitted with this Letter.

     Endorsements on certificates for Old Notes or signatures on bond powers
required by this Instruction 3 must be guaranteed by a financial institution
(including most banks, savings and loan associations and brokerage houses) that
is a
                                        7
<PAGE>

participant in the Securities Transfer Agents Medallion Program (each an
"Eligible Institution" and collectively, "Eligible Institutions").

     Signatures on the Letter need not be guaranteed by an Eligible Institution
if (A) the Old Notes are tendered (i) by a registered holder of Old Notes (which
term, for purposes of the Exchange Offer, includes any participant in the Book-
Entry Transfer Facility system whose name appears on a security position listing
as the holder of such Old Notes) who has not completed the box entitled "Special
Issuance Instructions" or "Special Delivery Instructions" on this Letter, or
(ii) for the account of an Eligible Institution and (B) the box entitled
"Special Registration Instructions" on this Letter has not been completed.

     4.  SPECIAL ISSUANCE AND DELIVERY INSTRUCTIONS.  Tendering holders of Old
Notes should indicate in the applicable box the name and address to which
Registered Notes issued pursuant to the Exchange Offer and/or substitute
certificates evidencing Old Notes not exchanged are to be issued or sent, if
different from the name or address of the person signing this Letter. In the
case of issuance in a different name, the employer identification or social
security number of the person named must also be indicated and such person named
must properly complete a Substitute Form W-9, a Form W-8BEN, a Form W-8ECI, or a
Form W-8IMY. Noteholders tendering Old Notes by book-entry transfer may request
that Old Notes not exchanged be credited to such account maintained at the
Book-Entry Transfer Facility as such noteholder may designate hereon. If no such
instructions are given, such Notes not exchanged will be returned to the name
and address of the person signing this Letter.

     5.  TRANSFER TAXES.  The Company will pay all transfer taxes, if any,
applicable to the transfer of Old Notes to it or its order pursuant to the
Exchange Offer. If, however, Registered Notes and/or substitute Old Notes not
exchanged are to be delivered to, or are to be registered or issued in the name
of, any person other than the registered holder of the Old Notes tendered
hereby, or if tendered Old Notes are registered in the name of any person other
than the person signing this Letter, or if a transfer tax is imposed for any
reason other than the transfer of Old Notes to the Company or its order pursuant
to the Exchange Offer, the amount of any such transfer taxes (whether imposed on
the registered holder or any other persons) will be payable by the tendering
holder. If satisfactory evidence of payment of such taxes or exemption therefrom
is not submitted herewith, the amount of such transfer taxes will be billed
directly to such tendering holder.

     6.  WAIVER OF CONDITIONS.  The Company reserves the absolute right to waive
satisfaction of any or all conditions enumerated in the Prospectus.

     7.  NO CONDITIONAL TENDERS.  No alternative, conditional, irregular or
contingent tenders will be accepted. All tendering holders of Old Notes, by
execution of this Letter, shall waive any right to receive notice of the
acceptance of their Old Notes for exchange.

     Although the Company intends to notify holders of defects or irregularities
with respect to tenders of Old Notes, neither the Company, the Exchange Agent
nor any other person shall incur any liability for failure to give any such
notice.

     8.  MUTILATED, LOST, STOLEN OR DESTROYED OLD NOTES.  Any holder whose Old
Notes have been mutilated, lost, stolen or destroyed should contact the Exchange
Agent at the address indicated above for further instructions.

     9.  WITHDRAWAL OF TENDERS.  Tenders of Old Notes may be withdrawn at any
time prior to 5:00 p.m., New York City time, on the Expiration Date.

     For a withdrawal of a tender of Old Notes to be effective, a written or
facsimile transmission notice of withdrawal must be received by the Exchange
Agent at its address set forth above prior to 5:00 p.m., New York City time, on
the Expiration Date. Any such notice of withdrawal must (i) specify the name of
the person having deposited the Old Notes to be withdrawn (the "Depositor"),
(ii) identify the Old Notes to be withdrawn (including the certificate number or
numbers and principal amount of such Old Notes), (iii) be signed by the holder
in the same manner as the original signature on this Letter by which such Old
Notes were tendered (including any required signature guarantees) or be
accompanied by documents of transfer sufficient to have the trustee under the
Indenture pursuant to which the Old Notes were issued register the transfer of
such Old Notes into the name of the person withdrawing the tender, and (iv)
specify the name in which any such Old Notes are to be registered, if different
from that of the Depositor. Any Old Notes so properly withdrawn will be deemed
not to have been validly tendered for exchange for purposes of the Exchange
Offer. Any Old Notes which have been tendered for exchange but which are not
exchanged for any reason will be returned to the holder thereof without cost to
such holder as soon as practicable after withdrawal, rejection of tender, or
termination of

                                        8
<PAGE>

the Exchange Offer. Properly withdrawn Old Notes may be retendered by following
the procedures described above at any time on or prior to 5:00 p.m., New York
City time, on the Expiration Date.

     All questions as to the validity, form, eligibility (including time of
receipt), acceptance and withdrawal of tendered Old Notes will be determined by
the Company in its sole discretion, which determination will be final and
binding. The Company reserves the absolute right to reject any and all Old Notes
not properly tendered or any Old Notes the Company's acceptance of which would,
in the opinion of counsel for the Company, be unlawful. The Company also
reserves the right to waive any defects, irregularities, or conditions of tender
as to particular Old Notes. The Company's interpretation of the terms and
conditions of the Exchange Offer (including the instructions of this Letter)
will be final and binding on all parties.

                                        9
<PAGE>

     10.  REQUESTS FOR ASSISTANCE OR ADDITIONAL COPIES.  Questions relating to
the procedure for tendering, as well as requests for additional copies of the
Prospectus, this Letter and other related documents may be directed to the
Exchange Agent, at the address and telephone number indicated above.

                           IMPORTANT TAX INFORMATION

     Each prospective holder of Registered Notes should complete the attached
Substitute Form W-9. Under current federal income tax law, a holder of
Registered Notes is required to provide the correct taxpayer identification
number ("TIN") on Substitute Form W-9 or otherwise establish a basis for
exemption from backup withholding to prevent any backup withholding on any
payments received in respect of the Registered Notes. If a holder of Registered
Notes is an individual, the TIN is such holder's social security number. If the
correct taxpayer identification number is not provided, a holder of Registered
Notes may be subject to a $50 penalty imposed by the Internal Revenue Service.

     Certain holders of Registered Notes (including, among others, all
corporations and certain foreign individuals) are not subject to these backup
withholding and reporting requirements. Exempt prospective holders of Registered
Notes should indicate their exempt status on Substitute Form W-9. A foreign
individual may qualify as an exempt recipient by submitting to the Exchange
Agent the appropriate Internal Revenue Service Form W-8 (e.g., W-8BEN, Form
W-8ECI or Form W-8IMY), properly completed and signed under penalty of perjury,
attesting to the holder's exempt status. The appropriate W-8 will be provided by
the Exchange Agent upon request. See the enclosed Guidelines for Certification
of Taxpayer Identification Number on Substitute Form W-9 for additional
instructions.

     If backup withholding applies, up to 30.5% of any "reportable payment" made
to the holder of Registered Notes or other payee must be withheld. Backup
withholding is not an additional federal income tax. Rather, the federal income
tax liability of persons subject to backup withholding will be reduced by the
amount of tax withheld. If withholding results in an overpayment of taxes, a
refund may be obtained from the Internal Revenue Service, provided the requisite
information is supplied.

PURPOSE OF SUBSTITUTE FORM W-9

     To prevent backup withholding with respect to any payments received in
respect of the Registered Notes, each prospective holder of Registered Notes to
be issued pursuant to Special Issuance Instructions should provide the Exchange
Agent with either: (i) such prospective holder's correct TIN by completing the
form below, certifying that the TIN provided on Substitute Form W-9 is correct
(or that such prospective holder is awaiting a TIN), that such prospective
holder is a U.S. person (including a U.S. resident alien), and that (A) such
prospective holder has not been notified by the Internal Revenue Service that he
or she is subject to backup withholding as a result of a failure to report all
interest or dividends or (B) the Internal Revenue Service has notified such
prospective holder that he or she is no longer subject to backup withholding; or
(ii) an adequate basis for exemption.

WHAT NUMBER TO GIVE THE EXCHANGE AGENT

     The prospective holder of Registered Notes to be issued pursuant to Special
Issuance Instructions is required to give the Exchange Agent the TIN (e.g.,
social security number or employer identification number) of the prospective
record owner of the Registered Notes. If the Registered Notes will be held in
more than one name or are not held in the name of the actual owner, consult the
enclosed Guidelines for Certification of Taxpayer Identification Number on
Substitute Form W-9 for additional guidance regarding which number to report.

                                        10
<PAGE>

--------------------------------------------------------------------------------
                       PAYOR'S NAME: STEEL DYNAMICS, INC.
--------------------------------------------------------------------------------

<Table>
<S>                             <C>                                                 <C>
 SUBSTITUTE                      PART 1 -- PLEASE PROVIDE YOUR TIN IN THE BOX AT    Social Security Number(s)
 FORM W-9                        RIGHT AND CERTIFY BY SIGNING AND DATING BELOW      or
                                                                                    Employer Identification Number(s)
                                                                                    -------------------------------
                                                                                    -------------------------------
                                -------------------------------------------------------------------------------------------
                                 PART 2 -- CERTIFICATION -- Under penalties of        PART 3 --
 DEPARTMENT OF THE               perjury, I certify that:                             [ ] Awaiting TIN
 TREASURY                        (1) the number shown on this form is my current
 INTERNAL REVENUE SERVICE        taxpayer identification number (or I am waiting
                                 for a number to be issued to me), (2) I am not
 PAYOR'S REQUEST FOR             subject to backup withholding either because I am
 TAXPAYER IDENTIFICATION         exempt from backup withholding, I have not been
 NUMBER (TIN)                    notified by the Internal Revenue Service (the
                                 "IRS") that I am subject to backup withholding as
                                 a result of a failure to report all interest or
                                 dividends, or the IRS has notified me that I am no
                                 longer subject to backup withholding, and (3) I am
                                 a U.S. person (including a U.S. resident alien).
---------------------------------------------------------------------------------------------------------------------------
</Table>

 CERTIFICATE INSTRUCTIONS --

 You must cross out item (2) in Part 2 above if you have been notified by the
 IRS that you are subject to backup withholding because of underreporting
 interest or dividends on your tax return. However, if after being notified by
 the IRS that you are subject to backup withholding you receive another
 notification from the IRS stating that you are no longer subject to backup
 withholding, do not cross out item (2).

 SIGNATURE ________________________________________  DATE ________________
--------------------------------------------------------------------------------

NOTE:  FAILURE BY A PROSPECTIVE HOLDER OF REGISTERED NOTES TO BE ISSUED PURSUANT
       TO THE SPECIAL ISSUANCE INSTRUCTIONS ABOVE TO COMPLETE AND RETURN THIS
       FORM MAY RESULT IN BACKUP WITHHOLDING OF UP TO 30.5% OF ALL PAYMENTS MADE
       TO YOU IN RESPECT OF THE REGISTERED NOTES DELIVERABLE TO YOU PURSUANT TO
       THE EXCHANGE OFFER. PLEASE REVIEW THE ENCLOSED GUIDELINES FOR
       CERTIFICATION OF TAXPAYER IDENTIFICATION NUMBER ON SUBSTITUTE FORM W-9
       FOR ADDITIONAL DETAILS.

    YOU MUST COMPLETE THE FOLLOWING CERTIFICATION IF YOU CHECKED THE BOX IN
                         PART 3 OF SUBSTITUTE FORM W-9

             CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER

     I certify under penalties of perjury that a taxpayer identification number
has not been issued to me, and either (a) I have mailed or delivered an
application to receive a taxpayer identification number to the appropriate
Internal Revenue Service Center or Social Security Administration Office, or (b)
I intend to mail or deliver such an application in the near future. I understand
that if I do not provide a taxpayer identification number within sixty (60)
days, up to 30.5% of all reportable payments made to me will be withheld until I
provide such a number.

SIGNATURE ____________________________________  DATE  ______________ , 2002

                                        11

