Size chart
US Size |
Inside Diameter |
Inside Circumference |
Australia + UK |
Pandora |
5 |
15.6mm |
49.3mm |
J 1/2 |
50 |
6 |
16.45mm |
51.9mm |
M |
52 |
7 |
17.3mm |
54.4mm |
O |
54 |
8 |
18.2mm |
57.0mm |
Q |
56 |
9 |
19.0mm |
59.5mm |
R 1/2 |
58 |
10 |
19.84mm |
62.0mm |
T 1/2 |
60 |