Diamond Grinder Wheel DG-WD122mm diameter 2.5mm thickness.Coarse Grit. Square Edge. Fast and cool cutting of ceramics, chrome cobalt, gold and other soft alloys. It does not leave marks on the porcelain. Long lasting, self-sharpening and makes a very soft and smooth cut.Mounted on a standard 3/32" handpiece shank. Premium quality diamond grinding wheel.