General description Multi-tooth TCT tip thick heavy-duty carbide alloy drill bits with high hardness, rust-proof, sturdy, and durable. This set includes 6 pieces of high-quality carbide drill bits ranging from 22mm to 65mm in diameter, designed for cutting holes in various materials including steel, stainless steel, copper, brass, fiberglass, iron, aluminum, wood, and different types of pipes. Technical specifications Material: Carbide and Alloy Steel Diameter: 22mm (0.86"), 30mm (1.18"), 35mm (1.38"), 45mm (1.77"), 50mm (1.97"), 65mm (2.56") Total Length: Approx. 68mm (2.68") Shank Diameter: Approx. 9mm (0.35") Compatibility and accessories Compatible with electric drills, hand drills, and augers Package includes: 6 x TCT Carbide End Mill Installation Should be installed for use in an electric drill Usage Ideal for drilling holes in stainless steel plates up to 3mm thick and iron plates less than 10mm thick Perfect for installing locks and knobs in doors and cabinets Can be used for cutting holes in thick steel plates, cast iron, non-standard angle iron, and other metals When cutting chilled materials, the cutting edge should be filled with coolant