Description:

Specifications: Twist Drill Bits Diameter: 3.5mm / 0.14-inch; Drill Bit Length: 110mm / 4.33-inch; Shank Diameter: 3.5mm / 0.14-inch; Total Length: 160mm / 6.3-inch; 1 x Straight Shank Twist Drill Bit. [Strength and Hardness]- Made of M35 HSS(High Speed Steel) cobalt steel. With high hardness and red hardness, wear-resistant, and fast drilling performance.. [Surface Treatment]- 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.. [Professional and DIY Use]- Suitable for drilling hard materials and hard metals such as cast iron, hard plastics, but also soft materials. When it cannot penetrate, try adjusting the RPM..