TCT Multi-Tooth Tipped Thick Heavy Duty Carbide Alloy with High Hardness, Rust Proof, Sturdy and Durable With a spring prevent jamming on operation Category Drilling diameter bore 22mm or 0.86", 30mm or 1.18", 35mm or 1.38", 45mm or 1.77", 50mm or 1.97" , 65mm or 2.56" Should be installed for use in electric drill. Widely used for stainless steel plate within 3mm, and iron plate within 10mm, as well 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 of 22-65 (mm) high quality carbide, which can cut holes on steel, stainless steel, copper, brass, fiberglass, formica, iron, aluminum, wood and various types of pipes in seconds Features: 1. 100 percent brand new and high quality. 2. Made of high quality alloy steel, the blade is extremely sharp and resistant to cutting. Good perforation. 3. Taking advantage of the use of our HSS hole saw set, it can be used for thick steel plate and thick wall metal pipe material punching. 4. When cutting chilled materials, its cutting edge should be filled with coolant. Can be fixed on hand drill and auger. 5. Can be used to cut holes on thick steel plate, cast iron, stainless steel, non-standard angle iron and other metal. Specifications: 1. Material: carbide and alloy steel 2. Diameter: Approx. 22-65mm or 226 or 0.56" (22mm or 0.86", 30mm or 1.18", 35mm or 1.38", 45mm or 1.77", 50mm or 1.97", 65mm or 2.56") p> 3.Total length: about 68mm or 2.68" 4. Shank Diameter: Approx 9mm or 0.35" Packing List:6 x TCT Carbide Burr