Size Guide - Rings
RINGS
| US | AUS & EU | Internal Diameter (mm) | Internal Circumference (mm) |
| 5 | J 1/2 | 15.7 | 49.3 |
| 6 | M | 16.7 | 52.5 |
| 7 | O | 17.3 | 54.4 |
| 8 | Q | 18.3 | 57.6 |
| 9 | R 3/4 | 18.9 | 59.5 |
| 10 | T 1/2 | 19.8 | 62.1 |
| 11 | V 1/2 | 20.6 | 64.6 |
| 12 | Y | 21.4 | 67.2 |
Size and cut may vary between brands; use this as a general guide.