22mm Dia. Diamond Coated Hole Saw Cutting Glass Ceramics

Diamond coated Hole saws, are used on Glass, ceramics, marble, and porcelain tile. Care: Water or coolant must always be used to cool and lubricate the tip. It reduces heat build-up, prolonging drill bit life and helps avoid heat fractures in the material. It also keep the diamond last longer (but the coolant and water are not included in the package).