HSS A/C Extension, 12" Fractional, Drill America
- Ideal for drilling in mild steel where extra length for reach is required
- 135 degree split point for self-centering and reduces thrust
- Black oxide surface treatment that is abrasion resistant, reduces chip welding and improves chip flow
- Manufactured to Aerospace Standard 907
- Sizes smaller than 1/16 and #52 have the 118 degree standard point