The Starrett KD06041 Diamond Tile Drill Bit Set is ideal for drilling small-diameter holes in many non-metallic materials. The diamond-tipped edge is created from a uniform coating of synthetic diamond grit bonded to a durable steel platform. Ensuring exceptional performance at high speeds and effective cutting action on materials such as brick, non-hardened glass, ceramic, tiles, and stone. They consistently deliver clean, accurate cuts and offer an extended product life well beyond conventional tools. Supplied in a handy carry case. Contains: 6 x Diamond Tile Drill Bits: 5mm (3/16in), 6mm (15/64in), 6.5mm (1/4in), 8mm (5/16in), 10mm (3/8in), 12mm (1/2in). 1 x WCD01 Water Coolant Dispenser. 1 x DG01 (V shape) Diamond Tile Drill Guide.