Size guide
Size Guide.
| UK size | US size | Inside diameter (mm) | Inside circumference (mm) |
|---|---|---|---|
| A | 1/2 | 12.04 | 37.8 |
| B | 1 | 12.45 | 39.1 |
| C | 1 - 1/2 | 12.85 | 37.8 |
| D | 2 | 12.04 | 40.4 |
| E | 2 - 1/2 | 13.26 | 41.7 |
| F | 3 | 13.67 | 42.9 |
| G | 3 - 1/2 | 14.07 | 44.2 |
| H | 4 | 14.48 | 45.5 |
| UK size | US size | Inside diameter (mm) | Inside circumference (mm) |
|---|---|---|---|
| A | 1/2 | 12.04 | 37.8 |
| B | 1 | 12.45 | 39.1 |
| C | 1 - 1/2 | 12.85 | 37.8 |
| D | 2 | 12.04 | 40.4 |
| E | 2 - 1/2 | 13.26 | 41.7 |
| F | 3 | 13.67 | 42.9 |
| G | 3 - 1/2 | 14.07 | 44.2 |
| H | 4 | 14.48 | 45.5 |