| DIAMETER | 0.249 INCHES NOMINAL |
| EFFECTIVE LENGTH | 0.560 INCHES MINIMUM AND 0.570 INCHES MAXIMUM |
| FIRST END STYLE | SQUARE |
| GRIP LENGTH | 0.580 INCHES MINIMUM AND 0.600 INCHES MAXIMUM |
| HEAD STYLE | FLAT |
| HEIGHT | 0.090 INCHES MINIMUM AND 0.095 INCHES MAXIMUM |
| PIN HEAD DIAMETER | 0.510 INCHES MINIMUM AND 0.530 INCHES MAXIMUM |
| SECOND UNDERCUT DIAMETER | 0.195 INCHES MINIMUM AND 0.215 INCHES MAXIMUM |
| SECOND UNDERCUT RADIUS | 0.030 INCHES MINIMUM AND 0.040 INCHES MAXIMUM |
| STYLE DESIGNATOR | GROOVE |
| UNDER HEAD LENGTH | 0.770 INCHES MINIMUM AND 0.790 INCHES MAXIMUM |
| UNDERCUT DIAMETER | 0.135 INCHES MINIMUM AND 0.155 INCHES MAXIMUM |
| UNDERCUT RADIUS | 0.020 INCHES MINIMUM AND 0.030 INCHES MAXIMUM |