M14 Dry Diamond Drill Bits Vacuum Brazed Drill Holesaw Cut For Porcelain Granite Tile Glass Ceramics Marble 6mm-68mm. The dry diamond drill bit uses vacuum brazed technology which allows the dry bit to be used at a higher temperature to cut through hard porcelain tile, ceramics, marble and slate with ease. The 6 / 8 / 10 / 12 /14mm Vaccum Brazed Diamond drilling bit built with integrated lubrivant , witch aids cooling and prolongs life, that means there is no requirement for additional lubricant. Vaccum Brazed Diamond drilling bits, Dry drilling granite & marble, masonry, concrete, tile/ceramic, glass, hard plastic….. Integrated lubricant, aids cooling and prolongs life, which means there is no requirement for additional lubricant. M14 Shank, prevents slippage in the chuck. Laser etched, diameter on body for ease of identification. Size: As The Picture Shown. Gold Kit(5pcs):20,35,45,50,68mm. Red Kit(5pcs):20,35,45,50,68mm. Black Kit(6pcs):20,35,40,45,50,68mm. Black Kit(8pcs):6,8,10,12,14,16,18,20mm. Start drill at 45 Degree to surface and align to 90 Degree as hole forms. Never use drills while machine is in hammer action. Holes Require No Further Work As Cutting Is Clean. Thank you for your understanding. (Excluding contrived damagement or misusage). Please kindly be noted that due to lighting effects, monitor`s brightness / contrast settings etc, there could be some slight differences in the color tone of the pictures and the actual item.