When decorating kitchen or bathroom walls, installing hold bars on showers, you drilling holes in mirrors or tiles, rely on the BISupply 5 Pack Diamond Masonry Drill Bit Set to get the job done without cracking your materials. Easily cut holes with a diameter of 6, 8, 10, 12, and 14mm wide. Simply attach the chosen granite diamond bit to your hand drill, angle grinder, or bench drill. Align the diamond tip drill bit at a 30-degree angle from cutting surface and begin drilling using low pressure. Once hole has started to form, slowly straighten hole saw drill bit to a 90-degree angle. Integrated wax melts while drilling to dissipate heat. Use water for wet drilling to increase porcelain drill bits life span. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.