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 shank allows drill bit to be held tightly and stably in power 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: 60pcs x Ceramic drill Only the above package content, other products are not included. Note: Light shooting 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.