Triangle Drill Bit, Glass Drill Bit, Concrete Drill Bit Set, Tile Drill Bit, Masonry Drill Bit Set. Multi-Purpose Carbide Tip Drilling Bit Set for Tile, Concrete, Brick, Glass, Plastic and Wood. The process of oxynitriding of the cutter head strengthens the drill hardness. Anti-rust treatment, clean and sharp without burrs. Small incision resistance, opening neat, smooth, not breaking the border. Remember to add water or coolant when drilling. Compatible Device: Hand drill, Rechargeable drill, Wrench 5 different sizes suitable for your different needs. Materials: Cemented Carbide NOTE: Item colors may differ slightly from item colors due to different lighting and screen settings. Due to manual measurements, please allow for slight size differences. Dimensions: 3mm + 4mm + 5mm + 6mm + 7mm Shipping color: silver Shipping Quantity: 5 pieces\/set