The Vitrex 102792 Hard Tile Drill Bit is designed for drilling hard tiles. It features a 8mm diameter and a slotted bit design for efficient waste removal. This drill bit is suitable for use on porcelain, granite, quarry, stone, marble, terracotta, and ceramic tiles. It is compatible with the VIT102788 Universal Hard Tile Drill Bit Guide and the VIT102790 Water Cooling System.