Size Chart
| Size |
Inner Dia(mm) |
Inner Circ(mm) |
| 3 | 14.1 | 49.4 |
| 3.5 | 14.5 | 50.6 |
| 4 | 14.9 | 51.9 |
| 4.5 | 15.3 | 53.1 |
| 5 | 15.7 | 54.4 |
| 5.5 | 16.1 | 55.7 |
| 6 | 16.5 | 57.0 |
| 6.5 | 16.9 | 58.3 |
| 7 | 17.3 | 59.5 |
| 7.5 | 17.7 | 60.8 |
| 8 | 18.1 | 62.1 |
| 8.5 | 18.5 | 63.4 |
| 9 | 19.0 | 64.6 |
| 9.5 | 19.4 | 66.0 |
| 10 | 19.8 | 67.2 |
| 10.5 | 20.2 | 67.8 |
| 11 | 20.6 | 68.5 |
| 11.5 | 21.0 | 69.1 |
| 12 | 21.4 | 69.7 |