Professional Type Vacuum brazed (VB) diamond drill bits are professionally manufactured for dry or wet drilling of all kinds of ceramics, porcelain, tiles, granite, marble, stoneware and other hard materials. / p> Thanks to VB technology, the diamond drill bits with higher efficiency and durability can dry or wet drill on hard porcelain and stone for longer time. The diamond drill bits with M14 threaded connection can be used directly in the angle grinder. Easy to use, applicable for DRY and WET drilling, works in all conditions. The perfect tools are at your disposal. With the diamond drill bit you can make the necessary holes for water inlets, drains, light points, etc. Drill Bits With diamond you can drill dozens of dry holes with HARTPORZELLAN, with a much longer life than with galvanized (almost ten times longer). You can drill many more wet holes. To extend the life of the diamond drill bits, follow the correct instructions for use.