| Metric |
USA |
UK |
| 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 |
10½ / 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 / - |
|
| |
|
|
|
| Metric |
USA |
UK |
| 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 |
2.0 mm |
0 |
14 |
| 2.25 mm |
1 |
13 |
| 2.75 mm |
2 |
12 |
| 3.0 mm |
- |
11 |
| 3.25 mm |
3 |
10 |
| 3.5 mm |
4 |
0 |
| 3.75 mm |
5 |
9 |
| 4.0 mm |
6 |
8 |
| 4.5 mm |
7 |
7 |
| 5.0 mm |
8 |
6 |
| 5.5 mm |
9 |
5 |
| 6.0 mm |
10 |
4 |
| 6.5 mm |
10½ |
3 |
| 7.0 mm |
- |
2 |
| 7.5 mm |
- |
1 |
| 8.0 mm |
11 |
0 |
| 9.0 mm |
13 |
00 |
| 10 mm |
15 |
000 |
| 12 mm |
17 |
- |
| 16 mm |
19 |
- |
| 19 mm |
35 |
- |
| 25 mm |
50 |
|
 |
|
|
|
|