Abracs TDB07 Diamond Tile Drill Bit 7mm  The Abracs TDB07 7mm Expert Dry Diamond Tile Drill Bit offers extreme lifetime, ultimate performance and precision drilling for all tiles including granite, porcelain and glass mosaic. Featuring premium quality steel body construction, self-sharpening multi layered diamond tip for fast and effective drilling. These drill bits also come with a unique wax coolant system which absorbs heat, eliminates the need for additional water cooling and increases drilling speed. Features: Suitable for granite, porcelain and glass mosaic Self sharpening Self cooling Hex shank Specification: Diameter: 7mm