ITEM NAME:10PCS 6mm Tungsten Carbide Drill Bit Glass Mirror Ceramic Cross Spear Head Description Features: Durable, strong toughness and wear resistance. High strength and hardness. Can be used with ordinary electric drill. Suitable for brick, block, stone, light concrete, ceramic, hard wood, glass and marble materials. When drilling hard materials (glass, ceramic tiles, marble or granite), lubricate with water. Specification: 100% brand new with high quality Materials:Tungsten Steel YG6 Type: Drill Bit Head Diameter: 6mm Package Included: 10pcs x Drill Bits Note: The colors may be a little difference for the different monitor display. Please check as much as possible to make sure the item is the one that you need. Please allow 0.5-1 inch difference due to manual measurement.(1inch=2.54cm).When drilling hard materials (glass, ceramic tiles, marble or granite), lubricate with water. 10pcs x Drill Bits. Materials:Tungsten Steel YG6. Suitable for brick, block, stone, light concrete, ceramic, hard wood, glass and marble materials.