Metric
US
UK (old)
2.00 mm
0
14
2.25 mm
1
13
2.75 mm
2
12
3.00 mm
–
11
3.25 mm
0
10
3.50 mm
4
–
3.75 mm
5
9
4.00 mm
6
8
4.50 mm
7
7
5.00 mm
8
6
5.50 mm
9
5
6.00 mm
10
4
6.50 mm
10.5
3
7.00 mm
0
2
7.50 mm
0
1
8.00 mm
11
0
9.00 mm
13
00
10.00 mm
15
000
12.00 mm
17
–
15.00 mm
19
–
20.00 mm
35
–
Metric
US
2.00 mm
0
2.25 mm
1
2.75 mm
2
3.00 mm
–
3.25 mm
3
3.50 mm
4
3.75 mm
5
4.00 mm
6
4.50 mm
7
5.00 mm
8
5.50 mm
9
6.00 mm
10
6.50 mm
10.5
7.00 mm
–
7.50 mm
–
8.00 mm
11
9.00 mm
13
10.00 mm
15
12.00 mm
17
15.00 mm
19
20.00 mm
35