Patented Wright Drive distributes contact over a larger surface area for greater gripping power and strength.
| PART NUMBER | NOM. SIZE | SHAPE | L | DS | DD | BD |
|---|---|---|---|---|---|---|
| 3910 | 5/16" | I | 2-1/4" | 33/64" | 3/4" | 2/32" |
| 3912 | 3/8" | I | 2-1/4" | 39/64" | 3/4" | 7/64" |
| 3914 | 7/16" | I | 2-1/4" | 11/16" | 3/4" | 13/64" |
| 3916 | 1/2" | II | 2-1/4" | 3/4" | 3/4" | 13/64" |
| 3918 | 9/16" | II | 2-1/4" | 55/64" | 55/64" | 11/32" |
| 3920 | 5/8" | II | 2-1/4" | 15/16" | 15/16" | 3/8" |
| 3922 | 11/16" | II | 2-5/16" | 61/64" | 61/64" | 3/8" |
| 3924 | 3/4" | II | 2-5/16" | 1-1/32" | 1-1/32" | 7/16" |