Diameter in mmAustralia & New ZealandUSA & Canada
15.1I4 1/4
15.5J4 3/4
16K5 1/4
16.3L5 3/4
16.7M6 1/4
17.1N6 3/4
17.4O7 1/4
17.7P7 1/2
18.1Q8
18.5R8 1/2
18.9S9
19.4T9 1/2
19.8U10
20.3V10 3/4
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