Features:* .* Made of alloy material, with high hardness and wear resistance, can be used for a long time.* Our drill bit enables precise drilling from the first u with shallow surface.* The spiral shaft also increases stock removal to leave cleanly drilled holes.* Suitable for bricks, blocks, stone, light concrete, ceramics, hardwood, glass and marble boards.* When drilling hard material (glass, porcelain floor tiles, marble or granite), use water to lubricate. Specifications:* Materials: Tungsten Carbide Steel* Quantity: 10 Pieces * Color: Black * Item Type: Drill Bit * Shape: Triangular Shank * Diameter: 6.0mm * Length: 100mm (Approx.) (Note: The diameter is measured by the triangle part, not the thread part) Package Contents: 10 * Drill BitsNote:1. The actual colors of the item may be slightly different from the pictures shown on website due to many factors. Such as monitor brightness and light brightness.2. Please allow slight error due to hand measurement.