US Sizes |
UK Sizes |
Inside diameter inches |
Inside diameter millimeters |
Inside circumference inches |
Inside circumference millimeters |
4.5 |
I |
0.602 |
15.3 |
1.89 |
48.0 |
5 |
J½ |
0.618 |
15.7 |
1.94 |
49.3 |
6 |
L½ |
0.65 |
16.5 |
2.04 |
51.8 |
7 |
N½ |
0.68 |
17.3 |
2.14 |
54.3 |
8 |
Q |
0.713 |
18.1 |
2.24 |
56.8 |
9 |
S |
0.744 |
18.9 |
2.34 |
59.3 |
10 11 |
T½ V½ |
0.778 0.81 |
19.7 20.5 |
2.44 2.54 |
62.1 64.6 |