Triangular-overlord Handle Multifunctional Drill Bits, Ultimate Punching Drill Bits, 7 Pcs Carbide Twist Drill Bit Set for Metal, Concrete, Brick, Glass and Wood

Features : - 100% new high quality. - The surface is of painted and full grinding processing with anti-rust treatment which is smooth to drill. - Single threaded U-type chip discharge groove make it smoother to drill. - The design of triangular handle make it more fastening to clamp and not easy to slip. - The material of Multi-Material Twist Drill Bit is high quality cemented carbide, which prevents drill cracking and improves durability. - One drill bit replaces two drill bits (glass & tile drill bit and drill bit). - Pointed design with carbide as a material can easily penetrate the various material. Specification : Material : Hard Alloy Tool Holder Type : Triangle Handle Cooling Type : Outer Cold Blade Top Corner : 45° Category : Hole expansion drill Handle Diameter : 2.5-9mm Chip Groove Length : 40-75mm Blade Diameter : 3-12mm Blade Length : 80-120mm Uses : Widely used in ceramic tile, glass, brick wall, wood, etc. Can be used in the hand electric drill, table drill, etc. Package Included : 7Pcs 3-12mm Drills 3mm 4mm 5mm 6 mm 8mm 10 mm 12mm. Note : When drilling hard material (glass,ceramic tile,marble or granite),please use water for lubrication. Universal handle for electric drills and bench drills, but NOT fit for impact drills. Please keep away from the kids under 3-year-old to avoid hurting by mistake.