METRIC SIZES US SIZES UK/CANADIAN SIZES
1mm 5/0 19
1.25mm 4/0 18
1.5mm 000 17
1.75mm 00 15
2.0mm 0 14
2.25mm 1 13
2.75mm 2 12
3.0mm - 11
3.25mm 3 10
3.5mm 4 -
3.75mm 5 9
4.0mm 6 8
4.5mm 7 7
5.0mm 8 6
5.5mm 9 5
6.0mm 10 4
6.5mm 10 1/2 3
7.0mm - 2
7.5mm - 1
8.0mm 11 0
9.0mm 13 00
9.5mm 14 -
10.0mm 15 000
12.0mm 17 -
16.0 19 -
19.0 35 -
25.0 50 -