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| ring size (us) | inside circumference (mm) | inside diameter (mm) |
|---|---|---|
| 7 | 54.4 | 17.3 |
| 7.5 | 55.7 | 17.7 |
| 8 | 57.0 | 18.1 |
| 8.5 | 58.3 | 18.5 |
| 9 | 59.5 | 19.0 |
| 9.5 | 60.8 | 19.4 |
| 10 | 62.1 | 19.8 |
| 10.5 | 63.4 | 20.2 |
| 11 | 64.6 | 20.6 |
| 11.5 | 65.9 | 21.0 |
| 12 | 67.2 | 21.4 |
| 12.5 | 68.5 | 21.8 |
| 13 | 69.7 | 22.2 |