5pcs/set Efficient Universal Hole Drilling Tool, 3-7mm Triangular Drill Bit, Multifunctional Cross Alloy Drill Point High Performance Woodworking Utility Tools Application: cement wall, concrete, tile, wood, metal, stainless steel, aluminum alloy, bubble brick, etc. Material: Cemented Carbide Product Weight: 125g Color: Silver Product Size: 3x70mm, 4x70mm, 5x76mm, 6x77mm, 7x78mm Package Contents: 5pcs Universal Drill Bit Various Sizes: 3mm, 4mm, 5mm, 6mm, 7mm, suitable for different needs. Can be used with standard electric hand drills and bench drills. Drill chuck capacity 10mm and above. Unique Cross Angle Design: Low cutting resistance, stable drilling, fast speed, no edge chipping. Clean holes, smooth finish, no burrs, no wobble, easy to clean. Fine Workmanship: Comprehensive rust-proof treatment. More wear-resistant and durable. Fully automated CNC polishing ensures consistent quality. High-Quality Materials: Made from high-quality YG6X alloy. Oxynitriding process on the cutting head increases hardness. Strong and powerful drill bits. Wide Use: Professional drill bits for glass and tile, providing smooth and precise drilling in ceramic tiles, marble, thin iron plates, mirrors, and glass. Always use water or coolant during drilling.