Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the previously filed Registration Statements of Illinois Tool Works Inc. on Form S-8 (File No.’s 333-105731, 333-108088, 333-69542, 333-142627 and 333-145392), Form S-4 (File No.’s 333-02671, 333-25471 and 333-88801), Form S-3 (File No.’s 33-5780 and 333-70691) and the previously filed Registration Statements of Premark International, Inc. on Form S-3 (File No.’s 33-35137 and 333-62105) of our report dated February 27, 2008, relating to the financial statements of Illinois Tool Works Inc. and Subsidiaries, and the effectiveness of Illinois Tool Works Inc.’s internal control over financial reporting, incorporated by reference in the Annual Report on Form 10-K of Illinois Tool Works Inc. for the year ended December 31, 2007.

/s/ DELOITTE & TOUCHE LLP

Chicago, Illinois
February 27, 2008