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| Size | Inches | CM |
| 6 | 19 | 48 |
| 6 1/8 | 19 3/8 | 49.2 |
| 6 1/4 | 19 3/4 | 50.2 |
| 6 3/8 | 20 1/8 | 51 |
| 6 1/2 | 20 1/2 | 52 |
| 6 5/8 | 20 7/8 | 53 |
| 6 3/4 | 21 1/4 | 53.9 |
| 6 7/8 | 21 5/8 | 54.9 |
| 7 | 22 | 55.8 |
| 7 1/8 | 22 3/8 | 56.8 |
| 7 1/4 | 22 3/4 | 57.7 |
| 7 3/8 | 23 1/8 | 58.7 |
| 7 1/2 | 23 1/2 | 59.6 |
| 7 5/8 | 23 7/ 8 | 60.6 |
| 7 3/4 | 24 1/4 | 61.5 |
| 7 7/8 | 24 5/8 | 62.5 |
| 8 | 25 | 63.5 |
| 8 1/8 | 25 3/8 | 64.5 |
| 8 1/4 | 25 3/4 | 65.4 |