| US | UK | France | Switzerland | Brazil | Inner diameter (mm) |
|---|---|---|---|---|---|
| 3.0 | F | 44 | 5 | 5 | 14.1 |
| 3.5 | G | 45 | 6 | 6 | 14.5 |
| 4.0 | H | 46 | 7 | 7 | 14.9 |
| 4.5 | I | 47 | 8 | 8 | 15.3 |
| 5.0 | J½ | 49 | 9 | 9 | 15.7 |
| 5.5 | K½ | 50 | 10 | 10 | 16.1 |
| 6.0 | L½ | 52 | 12 | 12 | 16.5 |
| 6.5 | M½ | 53 | 13 | 13 | 16.9 |
| 7.0 | N½ | 54 | 14 | 14 | 17.3 |
| 3.5 | G | 45 | 6 | 6 | 14.5 |
| 7.5 | O½ | 56 | 15 | 15 | 17.7 |
| 8.0 | P½ | 57 | 16 | 16 | 18.1 |
| 8.5 | P½ | 58 | 17 | 17 | 18.5 |
| 9.0 | R½ | 60 | 18 | 18 | 18.9 |
| 9.5 | S½ | 61 | 19 | 19 | 19.4 |
| 10.0 | T½ | 62 | 20 | 20 | 19.8 |
| 10.5 | U½ | 63 | 21 | 21 | 20.2 |
| 11.0 | V½ | 65 | 22 | 22 | 20.6 |
| 11.5 | W½ | 66 | 23 | 23 | 21.0 |
| 12.0 | X½ | 67 | 24 | 24 | 21.4 |
| 12.5 | Z½ | 69 | 25 | 25 | 21.8 |
| 13.0 | Z+1 | 70 | 26 | 26 | 22.2 |