ring-01
| US | UK | Japan | Germany | France | Switzerland | China | Circumference (mm) | Diameter (mm) |
|---|---|---|---|---|---|---|---|---|
| 5 | J1/2 | 9 | 15.75 | 49 | 9 | 9 | 49.3 | 15.7 |
| 6 | L1/2 | 12 | 16.5 | 51.5 | 11.5 | 12 | 51.8 | 16.5 |
| 7 | O | 14 | 17.25 | 54 | 14 | 14 | 54.4 | 17.3 |
| 8 | Q | 16 | 18 | 56.5 | 16.5 | 16 | 56.5 | 18.1 |
| 9 | S | 18 | 19 | 59 | 19 | 18 | 59.5 | 18.9 |
| 10 | T1/2 | 20 | 20 | 61.5 | 21.5 | 20 | 62.1 | 19.8 |
| 11 | V1/2 | 23 | 20.75 | 64 | 24 | 23 | 64.6 | 20.0 |
| 12 | Y | 25 | 21.25 | 66.5 | 27.5 | 25 | 67.2 | 21.4 |