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UK Ring Sizing

Inside Diameter (mm) Circumference (mm) Ring Size
12.04 37.80 A
12.24 38.50 A 1/2
12.45 39.10 B
12.65 39.70 B 1/2
12.85 40.40 C
13.06 41.00 C 1/2
13.26 41.70 D
13.46 42.30 D 1/2
13.67 42.90 E
13.87 43.60 E 1/2
14.07 44.20 F
14.27 44.80 F 1/2
14.48 45.50 G
14.68 46.10 G 1/2
14.88 46.80 H
15.09 47.40 H 1/2
15.29 48.00 I
15.49 48.70 J
15.70 49.30 J 1/2
15.90 50.00 K
16.10 50.60 K 1/2
16.31 51.20 L
16.51 51.90 L 1/2
16.71 52.50 M
16.92 53.10 M 1/2
17.12 53.80 N
17.32 54.40 N 1/2
17.53 55.10 O
17.73 55.70 O 1/2
17.93 56.30 P
18.14 57.00 P 1/2
18.34 57.60 Q
18.54 58.30 Q 1/2
18.75 58.90 R
18.95 59.50 R 1/2
19.15 60.20 S
19.35 60.80 S 1/2
19.56 61.40 T
19.76 62.10 T 1/2
19.96 62.70 U
20.17 63.40 U 1/2
20.37 64.00 V
20.57 64.60 V 1/2
20.78 65.30 W
20.98 65.90 W 1/2
21.18 66.60 X
21.39 67.20 X 1/2
21.59 67.80 Y
21.79 68.50 Z
22.00 69.10 Z 1/2
22.20 69.70 Z 1/2
22.61 71.00 Z1
23.01 72.30 Z2
23.22 72.90 Z3
23.62 74.20 Z4

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