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| Circumference(mm) | USA Size | British |
| 37.80 | 1/2 | A |
| 39.10 | 1 | B |
| 40.40 | 1 1/2 | C |
| 41.70 | 2 | D |
| 42.90 | 2 1/2 | E |
| 44.20 | 3 | F |
| 45.50 | 3 3/8 | G |
| 46.80 | 3 3/4 | H |
| 48.00 | 4 1/4 | I |
| 48.70 | 4 5/8 | J |
| 50.00 | 5 1/8 | K |
| 51.20 | 5 1/2 | L |
| 52.50 | 6 | M |
| 53.80 | 6 1/2 | N |
| 55.10 | 7 | O |
| 56.30 | 7 1/2 | P |
| 57.60 | 8 | Q |
| 58.90 | 8 5/8 | R |
| 60.20 | 9 1/8 | S |
| 61.40 | 9 5/8 | T |
| 62.70 | 10 1/4 | U |
| 64.00 | 10 5/8 | V |
| 65.30 | 11 1/8 | W |
| 66.60 | 11 5/8 | X |
| 67.80 | 12 | Y |
| 68.50 | 12 1/2 | Z |