PMD Products 4" 100mm Scotch type Brite Abrasive Non Woven Wheel Scuff 120 Grit Debur Tool 4" (100mm) diameter x 2" (50mm) material along shaft x 90mm overall length with shaft length included Working cylinder range of 3-5/8 - 4" Scotch type material 120 grit Works at a variety of speeds, up to 12000 RPM max Zinc-plated 1/4" (6mm) steel shank