HIGHDRIL Dry Diamond Drill Bits 12mm 1/2" with Hex Shank for Granite Marble Porcelain Tile Ceramic

diameter 12mm 1/2 Inch,diamond length 8mm,Quick-fit Hex Shank,fit a variety of quick-change chucks. Multi-purpose for drilling forhard materials especially tiles, porcelain ground, granite ceramic glass mirror marble stone masonry brick (not for wood) Wax are inserted to the drill bit for cooling and lubrication, without adding water.designed with hole and groove in the side of drill bit for removing stone chips. Hex shakes design can be gripped tightly that won't slip out easily,used in hand drill, bench drill angel drill(please install angle grinder drill chuck). This diamond drill bits set comes with a portable storage case for convenient use and store.Any problem feel free to contact us., Manufacturer: HIGHDRIL