Bosch Hex-9 drill bit with durable, high-performance carbide tip for long life in hard tiles. The tip is manufactured by fine grinding and features an asymmetric design for consistent drilling. Designed for accurate hole starting in bathroom tiles with centring tip. Suitable for tiles up to PEI 5 hardness and recommended for use at first drill speed only. Hex shank provides maximum power transfer in standard 3-jaw drills and hexagonal screwdriver chucks. 8 x 90mm. Suitable for Tiles, Porcelain, Ceramics & Non-Toughened Glass Dry Use Only For Combi Drills Steel 1/4" Hex Shank Carbide Tip Slow Drilling Speed Bosch Carbide Technology Suitable for Tiles, Porcelain, Ceramics & Non-Toughened Glass Dry Use Only For Combi Drills Steel 1/4" Hex Shank Carbide Tip Slow Drilling Speed Bosch Carbide Technology