Feature: 1. Suitable for electric drill and bench drill, etc., also suits for drilling stainless steel, copper plate, iron plate, aluminium alloy and other steel materials. 2. The drill bit is accurately made of Ti‑plated high‑speed steel, with high hardness and good heat resistance. 3. The cutting edge has high strength for fast gouging speed, which will effectively improve work efficiency. 4. The S‑shaped spiral groove of the drill bit is beneficial to lead out the shavings and save time and effort. 5. A powerful grinding wheel makes the blade groove sharper, and makes the driller sturdy and durable. Specification: Item Type: Twist Drill Bit Material: High Speed Steel Application: Hand drill, bench drill processing equipment, etc. Function: For drilling stainless steel, drilling copper, drilling iron, drilling aluminium alloy and other steel materials. Drill Bit Size(Approx.) Total Length(Approx.) Working Length(Approx.) 10.0mm / 0.4in 133mm / 5.2in 92mm / 3.6in 10.5mm / 0.4in 133mm / 5.2in 92mm / 3.6in 11.0mm / 0.4in 142mm / 5.6in 99mm / 3.9in 11.5mm / 0.5in 142mm / 5.6in 99mm / 3.9in 12.0mm / 0.5in 151mm / 5.9in 106mm / 4.2in 12.5mm / 0.5in 151mm / 5.9in 106mm / 4.2in 13.0mm / 0.5in 151mm / 5.9in 106mm / 4.2in . Package List: 5 x Twist Drill Bit