ALLOY STEEL MATERIAL: Drill bit set forged from premium quality ALLOY STEEL, glass drill bits provide smooth and precise drilling in ceramic tile, marble, mirror, glass, aluminum, concrete and wood. The durable bit should be well lubricated for the best possible results. This is most often done by running water over the drill surfaceDIMENSION: Designed with a 6mm pointed tip, the multi-material drill bits have a 1/4 inch design which reduces breakage. Length: 70mm, stem: approx. 3/16 inch. Our spear head drill bits are heavy duty, meant to last a very long timeAPPLICATION: Ideal for drilling ceramic tile, glass, marble and mirrors. When drilling hard materials, please use water for lubrication, good cooling can extend the service life of the drill bit. Glass drill bits are typically used with power drills to create holes in all of these materials TUNGSTEN CARBIDE TIP: The ceramic bit features a tungsten carbide tip for greater efficiency and longer life. During the drilling process, the coating rubs against the glass, creating a perfect hole in the material to be drilledWHAT YOU GET: The package includes 10pcs 6mm glass and tile drill bits and a plastic storage box, easy to carry. The multi construction glass bits are smooth, straight and have an ideal textureDimensionsEach bit is 70mm in total length, with an orange tungsten carbide top designed for easy drilling. At 15mm in length, the tungsten carbide tips of these drill bits will easily punch through material with minimal effort. The tip measures 6mm wide.