When decorating kitchen or bathroom walls, installing hold bars on showers, you drilling holes in mirrors or tiles, rely on the BISupply 2 Pack Orange 1/4-Inch Diamond Masonry Drill Bit Set to get the job done without cracking your materials. Easily cut holes with a diameter of 1/4-inch 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.