Buffs are a great finishing accessory for cleaning and light sanding. They work effectively on metal, wood, aluminum and plastics. Coarse and medium buff included. Mandrel 402 required. Model 511 has (1) dark brown, 180 grit, course buff and (1) light brown, 280 grit, medium buff.The Dremel Finishing Abrasive Buff is ideal for cleaning and light sanding. Constructed of non-woven fibers impregnated with aluminum oxide and silicon carbide, this buff works effectively on metal, glass, wood, aluminum and plastics. It can be used for sanding, removal of rust, paint and lacquer, light deburring on metals and plastics, cleaning solder connections, and creating textured patterns on woodworking projects. This pack includes one medium and one coarse abrasive buff. The dark brown coarse buff is 180-grit; the light brown medium buff is 280-grit.