HRC55 Twist Drills

Raw material: Zigong ZK30UF, high hardness, good wear resistance.

Coating: TiSiN，containing silica, very high surface hardness and high thermal resistance.

Tolerance Tolerance of end mill diameter every size: 0.000 ～ -0.050

Diameter： 1mm-25mm

Overall Length： 25-150mm

Customizd: production according to your needs.

Carbon Steel,Alloy Steel,Cast Iron,Hardened Steel