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Size (mm)Diameter (mm)Australian SizeBritish SizeFrench SizeGerman SizeItalian SizeAsia SizeSwiss SizeUSA/CAN Size
48 15.27 I 1/2 I 1/2   15.25 8 8   4 1/2
49 15.7 J 1/2 J 1/2   15.75 9.5 9   5
51 16.1 L L 51 3/4 16 10.5 11 11.75 5 1/1
52 16.51 M M 52 3/4 16.5 11.5 12 12.75 6
53 16.92 N N 54 17 13 13 14 6 1/2
55 17.35 O O 55 1/4 17.25 14.5 14 15.25 7
56 17.75 P P 56 1/2 17.75 16 15 16.5 7 1/2
57 18.9 Q Q 57 3/4 18 17 16 17.75 8
58 18.53 Q 1/2 Q 1/2 58 18.5 18.5 17   8 1/2
59 18.89 R 1/2 R 1/2 59 1/4 19 19.5 18   9
61 19.41 S 1/2 S 1/2 60 1/2  19.5 21 19   9 1/2
62 19.84 T 1/2 T 1/2 61 3/4 20 22 20   10
63 20.20 U 1/2 U 1/2 62 3/4 20.25 23.5 22   10 1/2
65 20.68 V 1/2 V 1/2 64 1/4 20.75 25 23   11
66 21.08 W 1/2 W 1/2 66 21 26.5 24   11 1/2
68 21.49 Y Y 67 1/2 21.25 27.5 25 27.5  12
69 21.89 Z Z 68 3/4 21.75 28.5 26 28.75  12 1/2
70 22.33       22 30 27   13