Includes (5) Grinding Stone. New, Bulk Packed. Ideal for sharpening, deburring and extended general purpose grinding on most materials including stainless steel. For use on metals, castings, welded joints, rivets and rust. Specially designed for working with conic surfaces. 1 high-quality industrial abrasive rotary accessory included. Compatible with the Following: Dremel: 4000, 400, 398, 395, 300, 285, 275, 200, 100, 8200, 800, 780,300,8220