Size Chart | Rings
| Diameter, mm | US Size |
EU/FR Size |
UK Size |
|---|---|---|---|
| 17 | 6.5 |
53 |
N |
| 17.5 |
7.25 |
55 |
O½ |
|
18 |
8 |
57 |
Q |
| 18.5 |
8.5 |
58 |
Q½ |
| 19 |
9 |
60 |
S |
| 19.5 |
9.5 |
61 |
T |
| 20 |
10.25 |
63 |
U |
| 20.5 |
10.75 |
64 |
V |
| 21 |
11.5 |
66 |
W½ |
| 21.5 |
12 |
68 |
Y |
| 22 |
12.5 |
69 |
Z |