Item Type: HSS Twist Drill Material: High speed steel Application: Hand drill, bench drill processing equipment, etc. Purpose: Drilling stainless steel, copper, iron, aluminum alloy and other steel materials Drill Size Full Length Working Length 2.5mm / 0.1in 57mm / 2.2in 30mm / 1.2in 3.0mm / 0.12in 60mm / 2.4in 33mm / 1.3in Package List 10 x HSS Twist Drill 1Suitable for processing equipment such as electric drills and bench drills, drilling stainless steel, copper plate, iron plate, aluminum alloy and other materials. 2The drill bit is precisely made of tiplated highspeed steel, with high hardness and good heat resistance. 3The cutting edge has high strength and fast gouge speed, which can effectively improve work efficiency. 4The drill bit has Sshaped spiral flute, which is conducive to discharging chips and saves time and effort during operation. 5The use of a powerful grinding wheel makes the blade flute sharper and smoother, and the drill bit is more robust and durable.