| Internal Diameter (mm) | Ring Size UK/AUS | Ring Size USA/CAN | Ring Size EU |
| 14.1 | F | 3 | 44 |
| 14.9 | H | 4 | 47 |
| 15.7 | J | 5 | 49 |
| 16.5 | L | 6 | 51 |
| 17.3 | N | 7 | 54 |
| 18.1 | P | 8 | 56 |
| 19.0 | R | 9 | 59 |
| 19.8 | T | 10 | 61 |
| 20.6 | V | 11 | 64 |
| 21.4 | X | 12 | 67 |
| 22.2 | Z | 13 | 69 |
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