High Quality: The drill bit is made of professional alloy steel. High hardness, strong and durable. It has good wear resistance and can be used longer than ordinary steel drill bits. The hexagonal shank provides stable holding and quick release in the electric drill. Application: 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. Please try to keep the drill vertical and use water or coolant for lubrication when drilling. Do not use these drill bits to drill hard tiles. Tungsten Carbide Tip: The bit features a tungsten carbide tip for increased efficiency and longer life. Professional Grade Alloy Steel - Smooth and precise drilling in ceramic tile, marble, mirror, glass, aluminum, concrete and wood. What You Get: Package includes 7pcs 6.35mm glass and tile drill bits, easy to carry. For DIY and home decoration enthusiasts, it is also an essential tool for