4" 100mm Abrasive Non Woven Scotch Type Brite Polishing Sanding Abrasive Ball 320 Grit Scuff tool is ideal for polishing odd shapes, inside tubes, gasket removal Works in any drill chuck, Provides consistent finish, For heavy scrubbing, removal of rust scale Brand Name Aluminum oxide abrasive Works at a variety of speeds, up to 12000 RPM max Zinc-plated 1/4" (6mm) steel shank