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US, Canada UK, Australia, Ireland, New Zealand Japan, India, China, South Africa Spain, Italy, Netherlands, Switzerland Inside Diameter & Circumference(mm)
4 H 7 6.75 14.88 & 46.8
4.25 H.5   7.5 15.09 & 47.4
4.5 I 8 8 15.29 & 48
4.75 J   8.75 15.49 & 48.7
5 J 1/2 9 9.25 15.7 & 49.3
5.25 K   10 15.9 & 50
5.5 K 1/2 10 10.5 16.1 & 50.6
5.75 L   11.25 16.31 & 51.2
6 L 1/2 11 11.75 16.51 & 51.9
6.25 M 12 12.5 16.71 & 52.5
6.5 M 1/2 13 13.25 16.92 & 53.1
6.75 N   13.75 17.12 & 53.8
7 N 1/2 14 14.5 17.32 & 54.4
7.25 O   15 17.53 & 55.1
7.5 O 1/2 15 15.75 17.73 & 55.7
7.75 P   16.25 17.93 & 56.3
8 P 1/2 16 17 18.14 & 57
8.25 Q   17.5 18.34 & 57.6
8.5 Q 1/2 17 18.25 18.54 & 58.3
8.75 R   19 18.75 & 58.9
9 R 1/2 18 19.5 18.95 & 59.5
9.25 S   20.25 19.15 & 60.2
9.5 S 1/2 19 20.75 19.35 & 60.8
9.75 T   21.5 19.56 & 61.4
10 T 1/2 20 22 19.76 & 62.1
10.25 U 21 22.75 19.96 & 62.7
10.5 U 1/2 22 23.25 20.17 & 63.4
10.75 V   24 20.37 & 64
11 V 1/2 23 24.75 20.57 & 64.6
11.25 W   25.25 20.78 & 65.3
11.5 W 1/2 24 26 20.98 & 65.9
11.75 X   26.5 21.18 & 66.6
12 X 1/2 25 27.25 21.39 & 67.2
12.25 Y   27.75 21.59 & 67.8
12.5 Z 26 28.5 21.79 & 68.5
12.75 Z 1/2   29 22 & 69.1
13   27 29.75 22.2 & 69.7
13.25 Z1   30.5 22.4 & 70.4
13.5     31 22.61 & 71
13.75 Z2   31.75 22.81 & 71.7
14 Z3   32.25 23.01 & 72.3
14.25     33 23.22 & 72.9
14.5 Z4   33.5 23.42 & 73.6
14.75     34.25 23.62 & 74.2
15     34.75 24.23 & 76.1
15.25     35.5 24.03 & 75.5
15.5     36.25 24.23 & 76.1
15.75     36.75 24.43 & 76.8
16     37.5 24.64 & 77.4
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