Uxcell M35 High Speed Steel Twist Drill Bit Gold Oxide 4mm Drill Diameter 200mm Length

Uxcell M35 High Speed Steel Twist Drill Bit Gold Oxide 4mm Drill Diameter 200mm Length 1. Made of M35 HSS(High Speed Steel) cobalt steel. With high hardness and red hardness wear-resistant and fast drilling performance. 2. The gold oxide surface treatment increases the hardness of the drill bit provides longer drilling life and better drilling performance and is more durable and corrosion resistant than uncoated drill bits. 3. Suitable for drilling hard materials and hard metals such as cast iron hard plastics but also soft materials. When it doesn t penetrate try adjusting the RPM. 4. Please keep cool and gentle using the working life of the twist drill bits can be largely prolonged by proper usage.