2pc Diamond Grinding Wheel Set Fits Dremel - Glass, Tile, Stone, Hardened Steel Hardest abrasive material available, cuts glass, stone, tile - even hardened steel Set of 2 wheels in popular diameters 19mm (3/4") and 25mm (1") Includes 2 mandrels with screws and washers; 1/8" shank Solid steel wheels have industrial diamond permanently brazed during manufacture Wheel thicknesses 2.6mm and 2.4mm