Diamond Coated Drill Bit Ceramic Glass Cutting Hole Saw 5,6,8,10,12,14,15,16,18,20,22mm Diameters 11 Pieces a Pack Size: 5,6,8,10,12,14,15,16,18,20,22mm outside diameters Some may lose varnish but that doesn't affect the usage. those who mind this, please noted. Make circle for glass, tiles, marble, granite, ceramic or other materials For shaping Buddha beads, jade stone, other beads