Product description:

Vacuum Diamond Drill bit is designed for high speed high performance and heavy duty use on Ceramic, Porcelain, granite, marble, glass, quartz, limestone,     fiberglass, terracotta, terrazzo, quarry, vitrified tiles.  High quality temperature resistant diamond grain for efficient, clean drilling. Filled with cooling wax and suitable for dry drilling. For longer service life, the use of water or coolant is recommended.