Sustainable! Bespoke! Heirloom!
Circumference
(inches)
Circumference
(mm)
Diameter
(mm)
Australia UK/
South Africa
France Germany Italy/
Spain/
Netherland
Japan/
South America
Switzerland USA/Canada
1  3/4 44.5 14.05 F F 44 14 4 4 4 3
1  25/32 45.2 14.45 G G 45 14.5 5  1/4 6 5.5 3  1/2
1  13/16 46 14.86 H H 47 15 6  1/2 7 7 4
1  7/8 48 15.27 I  1/2 I  -  1/2 48 15.25 8 8 9 4  1/2
1  15/16 49 15.7 J  1/2 J  -  1/2 50 15.75 9.5 9 10 5
2 51 16.1 L L 51  3/4 16 10.5 11 11.75 5  1/2
2  1/6 52 16.51 M M 52  3/4 16.5 11.5 12 12.75 6
2  1/8 53 16.92 N N 54 17 13 13 14 6  1/2
2  3/16 55 17.35 O O 55  1/4 17.25 14.5 14 15.25 7
2  1/4 56 17.75 P P 56  1/2 17.75 16 15 16.50 7  1/2
2  5/16 57 18.19 Q Q 57  3/4 18 17 16 17.75 8
2  3/8 58 18.53 Q  1/2 Q  1/2 58 18.5 18.5 17 19 8  1/2
2  7/16 59 18.89 R  1/2 R  1/2 59  1/4 19 19.5 18 20 9
2  1/2 61 19.41 S  1/2 S  1/2 60  1/2 19.5 21 19 21.5 9  1/2
2  9/16 62 19.84 T  1/2 T  1/2 61  3/4 20 22 20 22 10
2  5/8 63 20.2 U  1/2 U  1/2 62  3/4 20.25 23.5 22 23.5 10  1/2
2  11/16 65 20.68 V  1/2 V  1/2 64  1/4 20.75 25 23 25 11
2  3/4 66 21.08 W  1/2 W  1/2 66 21 26.5 24 26 11  1/2
2  13/16 68 21.49 Y Y 67  1/2 21.25 27.5 25 27.5 12
2  7/8 69 21.89 Z Z 68  3/4 21.75 28.5 26 28.75 12  1/2
2  15/16 70 22.33 -- -- -- 22 30 27 -- 13
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