Quantity: 5 pieces of drill bitsColor: copperModel: 3 mm + 4 mm + 5 mm + 6 mm + 7 mmHigh-quality material: Made of high-quality alloy as raw material. The tile drill bit is made of high-quality carbide, which is strong, sharp, durable, wear-resistant, not easy to deform and break, and the titanium surface coating makes the product not easy to fade.High-temperature resistance: High-temperature arm carbide tip, sharp and wear-resistant. The well-designed tungsten carbide tip can easily penetrate a variety of materials, and the surface is rust-resistant for easier drilling and chip evacuation.Fine surface polishing: Using environmentally friendly technology, nickel-chromium thick electroplating anti-rust treatment. Good wear resistance, high hardness and long service life.Professional Glass and Tile Drill Bits: The drill bits provide smooth and precise drilling on tiles, marble, sheet metal, mirrors and glass. Remember to add water or coolant when drilling.Suitable for your different needs: Can be installed on general hand drills, bench drills, cordless drills and electric wrenches. Suitable for glass, tiles, wood, ceramic, stone, concrete, brick, etc. When drilling hard materials (glass, porcelain, marble or granite), lubricate with water!