The Genesis Dry Drill Bit is designed to be used with standard drills to cut holes in porcelain, marble, granite and travertine tiles. It has a wax filled tip to keep cool while drilling, and therefore does not require the use of water or a cooling system. The diamond tip makes drilling hard tiles easy, and will last for 20-30 holes when used correctly. Use with the Genesis Drill Guide for accurate drilling. Available in 6mm, 8mm, 10mm and 12mm sizes.