uxcell 10 Pcs 6mm Diamond Grit Hole Saw Drill Bit for Glass Ceramics Porcelain Ceramic Tile 6mm Diamond Hole Saw / Core Drill Style Bit Diamond coating maximizes performance and retains a sharper cutting edge than traditional carbide or bimetal hole saws Side holes allow for easy slug removal after drilling Perfect for cutting accurate holes in a wide variety of materials such as glass and ceramics Nickel plating on Diamond Drill Bit maximizes your tools life with great resistance to corrosion