HSS Twist Drill Bits Material: HSS Sizes:0.2mm-20mm Ceryification:DIN338 Manufacturing Process:Roll Forged. HSS Twist Drill BitsMaterial: HSSSizes:0.2mm-20mmCeryification:DIN338Manufacturing Process:Roll Forged.Surface Finishing:Black, Black & White, Coffee, etc.Point Angle:118°or 135° (Split Point are available from 3mm) hot roll-forged flute with special heat treatment gives additional ...