No.391s – S-shaped Bi-Hexagonal Ring Spanner
Confirming to ANSI standards
Made of Chrome Vanadium Steel
Flank Drive Broaching in Box End for Extra Torque
Nikel-Chrome Plated, Fully Mirror Polished
Sizes
| MM | SAE |
| 6X7 | 1/4X5/16 |
| 8X9 | – |
| 10X11 | 3/8X7/16 |
| 12X13 | – |
| 14X15 | 1/2×9/16 |
| 16X17 | 5/8X11/16 |
| 18X19 | – |
| – | 3/4X7/8 |