Metric | USA | UK & Canda |
3.0 mm | 00 | - |
2.5 mm | 0 | 00 |
2.0 mm | 1 | 1 |
1.95 mm | 2 | - |
1.89 mm | 3 | - |
1.75 mm | 4 | 2 |
1.7 mm | 5 | - |
1.6 mm | 6 | - |
1.5 mm | 7 | 2.5 |
1.25 mm | 8 | 3 |
1.15 mm | 9 | - |
1.0 mm | 10 | 4 |
0.8 mm | 11 | - |
0.75 mm | 12 | 5 |
0.7 mm | 13 | - |
0.6 mm | 14 | 6 |
Metric | USA | UK & Canada |
2.0 mm | - | - |
2.25 mm | - | 14 |
2.5 mm | 1 / B | 13 |
2.75 mm | - | 12 |
3.0 mm | 2 / C | 11 |
3.25 mm | 3 / D | 11 |
3.5 mm | 4 / E | 10 |
3.75 mm | 5 / F | 9 |
4.0 mm | - | - |
4.25 mm | 6 / G | 8 |
4.5 mm | - | - |
4.75 mm | 7 | 7 |
5.0 mm | 8 / H | 6 |
5.5 mm | 8 / I | 5 |
6.0 mm | 10 / J | 4 |
6.5 mm | 10 1/2 / K | 3 |
7.0 mm | - | 2 |
8.0 mm | 11 / L | 0 |
9.0 mm | 13 / M | 00 |
9.5 mm | - | |
10.0 mm | 15 / N | 000 |
11.5 mm | P | |
12.0 mm | 17 | |
15.75 mm | Q | |