SIZE INSTRUCTIONS
USA Size (Our size)
Diameter (mm)
Circumference (mm)
Ring size
UK Size
EU Size
6
16.31
51.2
16
L
51
6.5
16.71
52.5
16.5
M
52
7
17.12
53.8
17
N
54
7.5
17.53
55.1
17.5
O
55
8
17.93
56.3
18
P
56
8.5
18.34
57.6
18
Q
58
9
18.75
58.9
18.5
R
59
9.5
19.15
60.2
19
S
60
10
19.56
61.4
19.5
T
61
10.5
19.96
62.7
20
U
63
11
20.37
64
20
V
64
11.5
20.78
65.3
20.5
W
65
12
21.18
66.6
21
X
67
12.5
21.59
67.8
21.5
Y
68
13
21.79
68.5
22
Z
69