Description
- High speed steel 4241
- Flexible,Useful and Anti-skid
- Slightly shake when working,makes the hole beautifully
- To reduce Burr,Chamfering,oval Chamfering that can't be done by twist drill btis
- No need of centre punch, not easy to break off compared to normal twist drill btis
Metric Step Drill Set,Zhushan 3Pcs High-Speed Steel Shank Titanium Step Drill Bits for Sheet Metal Hole Drilling from 4-12mm/4-20mm/4-32mm
