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US/CANADA SIZES

Diameter in millimeters

UK SIZES

3 14.0 F
3 1/2 14.4 G
4 14.8 H 1/2
4 1/2 15.2 I 1/2
5 15.6 J 1/2
5 1/2 16.0 L
6 16.5 M
6 1/2 16.9 N
7 17.3 O
7 1/2 17.7 P
8 18.2 Q 1/2
8 1/2 18.6 R 1/2
9 19.0 S 1/2
9 1/2 19.4 T 1/2
10 19.8 U 1/2
10 1/2 20.2 V 1/2
11 20.6 W 1/2
11 1/2 21.0 Y
12 12 1/2 21.4 Z
13 21.8
13 1/2 22.6
Ring Circumference in millimetres
5 49 J 1/2
5 1/2 50.5 L
6 51.5 M
6 1/2 52.5 N
7 54 O
7 1/2 55.5 P
8 57 Q 1/2
8 1/2 58.5 R 1/2
9 60 S 1/2
9 1/2 61 T 1/2
10 62.5 U 1/2