TCT Multi-Tooth Tipped Thick Heavy Duty Carbide Alloy with High Hardness, Anti-Rust, Robust and Durable; With a spring prevents jamming during operationCategory Drill diameter hole 22mm/0.86 \", 30mm/1.18 \", 35mm/1.38 \", 45mm/1.77 \", 50mm/1.97 \", 65mm/2.56 \" Must be installed for use in a drill. Widely used for stainless steel plate within 3mm, and iron plate less than 10mm, both for aluminum alloy metal hole operation Perfect for installing locks, knobs in doors and cabinets or for drilling larger diameter holes through desks, etc. 6 pieces high quality 22-65 (mm) carbide, which can cut holes in steel, stainless steel, copper, brass, fiberglass, formica, iron, aluminum, wood and various types of pipes in secondsSpecifications:1. Material: carbide and alloy steel2. Diameter: Approx 22-65mm/226/0.56 \" (22mm/0.86 \", 30mm/1.18 \", 35mm/1.38 \", 45mm/1.77 \", 50mm/1.97 \", 65mm/2.56 \")3. Total length: approx 68mm/2.68 \" 4. Shank diameter: Approx 9mm / 0.35 \" Package list:6 x TCT Carbide Cutter