Uxcell M35 High Speed Steel Parabolic Flute Drill Bit 4.2mm Drilling Dia. 126mm Length Gold Oxide Cobalt Steel

Uxcell M35 High Speed Steel Parabolic Flute Drill Bit 4.2mm Drilling Dia. 126mm Length Gold Oxide Cobalt Steel 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. The parabolic flute adopts a wide groove structure to increase the chip flow rate and ensure fast and easy chip removal and rapid penetration. 4. Please keep cool and gentle using the working life of the twist drill bits can be largely prolonged by proper usage.