Specially designed diamond ground tungsten carbide tipped tile drill. Heattreated to increase the life span of the drill bit. Unique tip brazing method ensures no tip loss even through the hardest materials. Exclusive design, triangular shank, preventing drill seizure. . Sand blast finish for increased durability. Specialist flute design enabling effective dust extraction. For use with drill driver machines intoall types of tiles including porcelain, granite and marble. No requirement for water cooling as the drill is used on a very slow speed for maximum efficiency. Sizes to suit most types of wall plug.