Diameter(mm)	United States& Canada	Europe	UK &Austalia	Singapore Japan	Hong Kong	Switzerland
14.1	3	44	F1/2	4	6	4
14.3		45	G	5		5 1/4
14.5	3.5		G 1/2		7
14.7		46	H	6		6 1/2
14.9	4	47	H 1/2	7	8
14.9	4	47	H 1/2	7	8	6 1/2
15.1			I			7 3/4
15.3	4.5	48	I 1/2	8	9
15.5			J		10	9
15.7	5	49	J 1/2	9
15.9		50	K		11	10
16.1	5.5		K 1/2	10
16.3		51	L		12	11 3/4
16.5	6	52	L 1/2	11	13	12 3/4
16.7			M	12
16.9	6.5	53	M 1/2	13	14	14
17.1		N
17.3	7	54	N 1/2	14	15	15 1/4
17.5		55	O		16
17.7	7.5		O 1/2	15		16 1/2

Round