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US size	Inside (mm)	Diameter (inch)	inside (mm)	Circumference (inch)
5	15.7	0.62	49.3	1.94
6	16.5	0.65	51.9	2.04
7	17.3	0.68	54.4	2.14
8	18.1	0.71	57.0	2.24
9	19.0	0.75	59.5	2.34
10	19.8	0.78	62.1	2.44
11	20.6	0.81	64.6	2.54
12	21.4	0.84	67.2	2.65