HSS taper shank twist drill

Production technics usuaslly  1.roll forged 2.Milled 3.Fully ground

Surface finishing  usually as to1.bright 2. Tin Coating 3.Black&Bright 4.Black Finishing 5.Sandblast&Polished Finishing

Using Material: 1. Roll Forged  HSS-M2/W9/W4   2.Milled HSS-M42/M35/M2/W9  3.Fully Ground(see rurye) HSS-M42/M35/M2/W9

Cutting edge: 1. 118 degree general angle      2. 118 degree Form A Point