Roxon 28982 sanding discs for rotary tools contain 5 each 45/64 inch 120 grit and 5 each 45/64 inch 150 grit plus sanding pad with 7/64 inch shank. Sanding disc is ideal for furniture refinishing, removing rust and multiple sanding/finishing jobs on wood, plastic, leather, non-ferrous metal, steel, welded joints and castings. The disc is centered on a 3 millimeter shank and is designed for use on Roxon"s Microdot and Rotary Tool lines.