ALLOY MATERIAL: Tile Drill Bit made of alloy material with high hardness and wear resistance. FOUR BLADE: Tile glass Drill Bits are designed with four blade, low incision resistance, precise and effortless drilling. HEXAGONAL SHANK: Hexagon shank, the electric drill more tightly clamped, drilling does not slip. USAGE: The Triangle Drill Bit can be used for ceramic, glass, tile, marble, granite, brick, wood, etc. Add coolant or water when drilling. APPLICATION: Concrete Drill Bit can be installed on electric drill/hand drill/bench drill. Specification: Material: Alloy Size Chart: Hex Shank Diameter: 6.35mm/0.25inch 6mm: Drill Bit Overall Length: 10cm/3.94inch, Diameter: 6mm/0.24inches 8mm: Drill Bit Total Length: 10.6cm/4.17inch, Diameter: 7mm/0.28inch 10mm: Drill Bit Overall Length: 11.6cm/4.57inch, Diameter: 10mm/0.39inch Package Includes: 1 Tile Bits Note: Please allow slightly errors due to manual measurement and different monitors.