Description: Multifunctional: This kind of drill bit is suitable for drilling ceramics, tiles, glass materials, woodworking, plastic materials, brick wall and others, and the hard materials can be drilled with water. Non-slip: The drill bit is designed in triangular shape, which can prevent slip when drilling or punching, avoiding harming your hands. High speed: The sharpener works with low resistance, it can remove the chips quickly, making your work more convenient and easier, and it can through all kinds of materials effectively. Wide use: This drill is suitable for many drills, including regular impact drill, electric drill and others, saving time and strength for you to match it. Sturdy: The drilling tool is made of hard alloy, which can be used for a long time because it is durable and long-lasting, not easy to be broken or damaged. Specification: Material: hard alloy. Color: show as pictures. Size: approx. 3mm/0.12inch,4mm/ 0.16inch, 5mm/0.2inch, 6mm/0.24inch, 7mm/0.28inch, 8mm/0.31inch, 10mm/0.39inch, 12mm/0.47inch. Note: Due to the light and screen difference, the item's color may be slightly different from the pictures. Please allow a slight deviation for the measurement data and make sure you do not mind before ordering. Package included: Type 1: 7 pieces drill bits(3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm). Type 2: 12 pieces drill bits(3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm, 12mm). Type 3: 10 pieces drill bits(6mm).