| Location | Meadowbank |
| Manufacturer | Bedford Vanadium |
| Weight | 1 |
One large spanner!
One end is 5/8 Whitworth or 11/16 British Standard size, equivalent to 1.1 inch or 27.94mm in new money.
The other end is 11/16 Whitworth or 3/4 British Standard size, which is equivalent to 1.2 inches or 30.48mm.