Multi-material Drill Bit For Drilling in Tile, Glass, Concrete, Brick, Wood, and Plastic. Many in easy install and using High Quality Carbide with a reinforced head pointed design strong tungsten carbide tip can easily penetrate various material. that prevents bit cracking and provides a longer lif. U type slot design with fast drilling dust remove, 3-flats allows drill bit to be held tightly and stably in drill. When drilling hard material (glass, porcelain floor tile, marble or granite), please use water for lubrication. Color: silver + black Material: Carbide Diameter: 6mm Length: about 100mm Package Contents: 10pcs * Ceramic drill Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.