1. ALLOY STEEL MATERIAL: Gunpla Drill Bit Set Forged from Premium Quality ALLOY STEEL, Glass Drill Bits allow smooth and precise drilling in ceramic tile, marble, mirrors, glass, aluminum, concrete and wood. The durable drill bit should be well lubricated for the best possible results. This is most often done by running water over the drilling surface.^ 2. DIMENSION: Designed with 6mm pointed tip, multi-material drill bits have a design. Length: 75 mm. Our spear head drills are very strong, intended to last a very long time^ 3. APPLICATION: Ideal for drilling ceramic tile, glass, marble and mirrors. When drilling hard materials, please use water for lubrication, good cooling can extend the life of the drill bit. Glass drills are typically used with electric drills to create holes in all of these materials.^ 4. TUNGSTEN CARBIDE TIP: The ceramic bit features a tungsten carbide tip for longer efficiency and life. During the drilling process, the coating rubs the glass, creating a perfect hole in the material to be drilled^ 5. WHAT YOU GET: The package includes 10 pieces 6mm glass and tile drill bits and plastic storage box, easy to carry. Multi-construction glass pieces are smooth, straight and have an ideal texture