BGTEC Dry Diamond Drill Bits 2pcs 12mm Hex Shank for Granite Marble Porcelain Tile Ceramic

diameter 12mm, diamond length 10mm,Hex Shank 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