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Ring size guide

US UK Italy France
4 8 46
I 8/9 47
I1 9 48
J 10 49
5 10/11 49.5
K 11 50
12 50.5
L 12/13 51
6 13 52
M 14 53
14/15 53.5
N 15 54
7 15/16 54.5
O 16 55
17 55.5
P 17/18 56
8 18 57
Q 18/19 58
19 58.5
R 19/20 59
9 20 60
SIZE mm Ø (inside diam. mm)  No UK US U (inside circum. mm)
62 19.7 19.0 U 10 1/4 62
61 19.4 18.0 T 9 3/4 61
60.5 19.1 17.0 S 1/2 9 3/8 60.5
59 18.8 16.0 R 1/2 8 7/8 59
57 18.1 15.0 Q 8 1/4 57
56 17.8 14.0 P 1/2 7 3/4 56
55 17.5 13.0 P 7 1/2 55
54 17.2 12.0 O 7 54
53 16.9 11.0 N 6 1/2 53
52 16.6 10.0 M 1/2 6 1/4 52
51 16.2 9.0 L 1/2 5 3/4 51
50 15.9 8.0 K 1/2 5 3/8 50
48 15.3 7.0 J 4 5/8 48
47 15.0 6.0 I 4 1/4 47
46 14.6 5.0 H 3 3/4 46
45 14.3 4.0 G 3 1/2 45
43 13.7 3.0 E 1/2 2 3/4 43
42 13.4 2.0 D 1/2 2 1/4 42
41 13.1 1.0 C 1/2 1 3/4 41