1、Suitable for processing equipment such as hand drills and bench drills, and can drill stainless steel, drill copper, drill iron, drill aluminum and other steel materials 2、The drill bit is precisely made of ti‑plated high‑speed steel, with high hardness, good heat resistance and long service life 3、High cutting edge strength, fast gouge speed, fine workmanship can effectively improve work efficiency 4、The drill bit has an S‑shaped spiral groove, which is beneficial to send out the shavings and save time and effort during operation 5、Using a powerful grinding wheel to make the blade groove sharper and smoother, making the drill more robust and durable Item Type: Twist Drill Bit Material: High speed steel Application: Hand drill, bench drill processing equipment, etc. Uses: Drilling stainless steel, drilling copper, drilling iron, drilling aluminum alloy and other steel materials Drill size(mm)(approx.) Overall length(mm)(approx.) Working length(mm)(approx.) 7mm / 0.3in 108mm / 4.3in 69mm / 2.7in 7.5mm / 0.3in 109mm / 4.3in 70mm / 2.8in 8mm / 0.3in 116mm / 4.6in 75mm / 3in 8.5mm / 0.3in 116mm / 4.6in 75mm / 3in 9mm / 0.4in 125mm / 4.9in 81mm / 3.2in 9.5mm / 0.4in 125mm / 4.9in 81mm / 3.2in 10 x Drill Bit