Diamond drill bit designed for precise and clean dry cutting of stoneware, ceramics, porcelain and compositesos Allows you to cut holesosuch as for decorative elements, installation of plumbing or drainsoetc. • quick and precise cutting without brittleness of cut materialsos• steel body with diamond-coated edge by pr& oacute;s brazing method oacute;tion soldering• increased resistance to high temperatures, friction and mechanical damage• designed for use with a grinder (M 14 thread)• max speed: 12200 rpm For precise and clean dry cutting of stoneware, ceramics, porcelain and composites