Glass Drill Bit Diamond Core Drill Set Ceramic Hole Saw for Glass, Marble, Tile or Granite etc 6-30mm Features:-This diamond coated core drill bit removes the complete circle from glass, tile, marble, granite, ceramic or other materials and only needs water for lubrication-Can be used with standard electric drill bit-Always use lubrication (water), otherwise the diamond drill bit will burn-Start the hole diagonally, make a round trace, then stick the drill bit straightSpecifications:** Size**:-6mm outer diameter-8mm outer diameter-10mm outer diameter-12mm outer diameter-15mm outer diameter-16mm outer diameter-18mm outer diameter-20mm outer diameter-22mm outer diameter-30mm outer diameterPackage Included:1x10pcs 6-30mm diamond coated core milling cutter marble tiles glass ceramic hole saw