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| Size Reference Chart | |||||||
| USA | U.K. | China | Japan | Diameter | Circumference | ||
| mm | inch | mm | inch | ||||
| 5 | J 1/2 | 9 | 9 | 15.6 | 0.61 | 49 | 1.93 |
| 6 | M | 12 | 12 | 16.4 | 0.65 | 52 | 2.05 |
| 7 | O | 14 | 14 | 17.3 | 0.68 | 54.5 | 2.15 |
| 8 | Q | 16 | 16 | 18.1 | 0.71 | 57 | 2.24 |
| 8½ | Q½ | 17 | 17 | 18.5 | 0.73 | 58.3 | 2.30 |
| 9 | S | 18 | 18 | 18.9 | 0.74 | 59.5 | 2.34 |
| 9½ | S½ | 19 | 19 | 19.3 | 0.76 | 60.8 | 2.39 |
| 10 | T 1/2 | 20 | 20 | 19.7 | 0.78 | 62 | 2.44 |
| 10¼ | U | 21 | 21 | 20 | 0.79 | 62.7 | 2.47 |
| 10½ | U½ | 22 | 22 | 20.17 | 0.79 | 63.4 | 2.50 |
| 11 | V 1/2 | 23 | 23 | 20.6 | 0.81 | 64.5 | 2.54 |
| 12 | Y | 25 | 25 | 21.4 | 0.84 | 67.5 | 2.66 |
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