Kennametal (KMT) 8-K Changes in Registrant.s Certifying Accountant

EXHIBIT 16.1

June 1, 2005

Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549

Commissioners:

We have read the statements made by the Kennametal Retirement Income Savings Plan (formerly known as the Greenfield Industries, Inc. Retirement Income Savings Plan) (copy attached), which we understand will be filed with the Commission, pursuant to Item 4.01 of Form 8-K, as part of the Plan’s Form 8-K report dated May 27, 2005. We agree with the statements concerning our Firm in such Form 8-K.

Very truly yours,

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP