| Multi-tipped TCT thick carbide alloy with high hardness, anti-rust, sturdy and durable; With a spring to prevent jamming during operation Category Drilling diameter bore 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 power drill. Widely used for stainless steel plate less than 3mm and iron plate less than 10mm, as well as aluminum alloy metal hole operation Perfect for installing locks, knobs in doors and doors cabinets or for drilling larger diameter holes through desks etc. 6 pieces of 22-65mm) high quality carbide, which can drill holes on steel, stainless steel, copper, brass, fiberglass, formica, iron, aluminum, wood and various types of … | |