This Mexco TDXCEL M14 Dry Diamond Tile Drill Bit is designed for all types of tile, including porcelain. No water is required for drilling. It can be used directly on any angle grinder with an M14 thread or any mains-powered drill using an M14 Chuck Adaptor. This 7mm bit is ideal for porcelain, ceramic tiles, and hard materials. It can be used on angle grinders or mains drills with a hex adaptor. The special wax-filled core melts, lubricates, and cools during drilling, ensuring maximum performance and cost per cut. Part number 57587.