99PCS HSS Twist Drill Bits Set

Diameter: 1.5-10mm.

Material: HSS 4241, HSS 4341， HSS 6542，M35(Cobalt 5%)

Surface Finish: Black Oxide/Tin-Coated/Bright White/Black & Gold/Black & White/Sandblast & Polish/Rainbow

Process: Fully Ground, Milled, Roll Forged, Roll & Polished

Standard: DIN338, DIN340, DIN1897, DIN1869, Jobber Length.