Features: 1. It has strong toughness and wear resistance 2. Incision resistance are small, increase the opening speed, long service life 3. Carbide Point with 4 Cutting edges 4. Can be installed in the hand drill, electric drill 5. Suitable for Ceramics, granite, tiles, stone, wood, plastic,concrete wall to drilling hole Specifications: Material: Tungsten carbide Bit Type: Tile & Glass Drill Bit Drill diameter: 5mm / 6mm / 8mm / 10mm / 12mm