【ALLOY STEEL MATERIAL】: Drill bit set forged from premium quality ALLOY STEEL, the glass drill bits provide smooth and precise drilling in ceramic tile, marble, mirrors, 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 drilling surface 【DIMENSION】: Designed with a 6mm sharp tip, the multi-material drill bits have a 1/4 inch design that reduces breakage. Length: 70 mm, rod: approx. 3/16 inch. Our spear head drill bits are heavy duty, meant to last a very long time 【APPLICATION】: Ideal for drilling ceramic tiles, 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 cited materials 【TUNGSTEN CARBIDE TIP】: The ceramic bit features a tungsten carbide tip for longer efficiency and life. During the
