Dry drill in hard tiles including porcelain. Unique tip for easy starting. The EXPERT Hex-9 Hard Ceramic Drill Bit delivers long life drilling in hard tiles, such as porcelain. This highly durable bit uses Bosch's Carbide Technology which enables it to last up to 10x longer life compared to a standard bit. Its advanced asymmetric tip design ensures edges bite like teeth into the hard materials. In addition, start holes accurately with the specially-designed centering tip. Hex shank for maximum power transfer in standard three-jaw drills and hexagonal screwdriver chucks. Technical Specifications: Diameter mm: 6. Length mm: 90. Shank Type: Hex. Drill hard tiles without lubricant or cooling. Tool should be used in first gear.