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 strengthen 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. 5 different sizes suitable for your different needs. Materials: Cemented Carbide Weight: 125g 5PCS: 3mm + 4mm + 5mm + 6mm + 8mm Compatible Device: Hand drill, Rechargeable drill, Wrench Package list: 5 x Universal Drilling Tool