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Vacuum brazed diamond drill bits for Dry Use on: ceramic, porcelain granite, marble, glass, quartz limestone, fibreglass, terracotta terrazzo, quarry and vitrified tiles

* a high speed drill/grinder must be used；

* working speed: 6000-10000RPM；

* use in dry, start with easy touch will get min. 30% more cutting efficiency & life；

* start with 45ºangle on the spot move drill upright when the hole starts；

* designed for high performance and heavy duty use on all tilling materials and other hard stone masonry products;

* guaranteed to make a hole in 5 seconds  on up to 10mm thick porcelain tiles；

* excessive wear will occur on abrasive materials eg. sand stone, concrete etc.