Dremel 3/8" x 1/2" Grinder with 1/8" Shank is for sharpening, deburring, and general-purpose grinding on most materials, including stainless steel. It has a speed rating of 35,000 rpm and is made of aluminum oxide, a high-quality industrial abrasive made for extended general-purpose grinding on metals, castings, welded joints, rivets, and rust.