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