6pc 1/2" Diamond Sanding Drums - Fits Dremel - Glass Tile Stone Unique accessory for Dremel and other power rotary tools Steel drums with industrial diamond permanently brazed - hardest abrasive material available 1/2" diameter x 1/2" height, 150 grit Set of 6 drums plus rubber-sleeved mandrel, 1/8" shank Use on stone, tile, glass, hardened steel