Mgtgbao 6pc 1/2” Green Dry Diamond Drill Bits Set， 12mm Hex Shank Core Drill Bit Brazed with Cooling Wax for Porcelain Tile Ceramic Concrete Granite Marble Hard Materials (not for Wood).

Mgtgbao Dry Diamond Drill Bits :6pc 1/2” (12mm) with Hex Shank for Porcelain Tile Ceramic Marble Feature: Multi-purpose drilling for granite & marble masonry concrete tile/ceramic stone Wax inside for cooling our Diamond Tipped Drill Bits have wax cores built-in which automatically absorb and dissipate heat as you go Dry drilling and Use water for longer time.Notice:Please use with water when drilling granite Vacuum Brazed diamond technology provide very high efficiency cuts faster and lasts longer Size: 1/2” (12mm) Quality:6pcs Lengthen :80mm Package includes: 6pc 1/2 inch (12mm) diamond drill bits diameter Using Steps: Step 1: Start Drilling the hole in an angle about 45 degrees to the surface so the drill has the chance to start and will prevent the drill slipping Step 2: Slowly move the drill bit into a more up-right position and wobble the drill bit in the circular motion S