EX-23.1 2 h57974exv23w1.htm CONSENT OF PANNELL KERR FORSTER OF TEXAS, P.C.

exv23w1

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the Registration Statement on Form S-8 No. 333-38020 pertaining to the Grant Prideco, Inc. 401(k) Savings Plan of our report dated June 23, 2008, with respect to the financial statements and supplemental schedule of the Grant Prideco, Inc. 401(k) Savings Plan included in this Annual Report (Form 11-K) as of December 31, 2007.

/s/ Pannell Kerr Forster of Texas, P.C.

Houston, Texas
June 25, 2008