- Features
| A57 Geometry - The special one |
| For unfavorable machining conditions |
| Maximum cutting edge stability |
| High feed rates |
| Straight border (no wave on the flank face) |
| 0.08 to 0.2 mm cutting edge tolerance |
| 0.05 to 0.15 mm inscribed circle tolerance |
| +/-0.13 mm thickness tolerance |
| 4 cutting edges |
| 40 to 60 deg double countersink hole |