Dremel 2-Pack 1/4" x 5/8" Grinder with 1/8" Shank is used for sharpening, deburring, and general-purpose grinding on most materials including stainless steel. It has an aluminum oxide abrasive material and a 1/8" arbor/shank size. It has a speed rating of 35,000 rpm and a diameter of 1/4". DREMEL 953 aluminum oxide grinding stone is a high-quality industrial abrasive made for extended general-purpose grinding on metals, castings, welded joints, rivets, and rust.