Size Chart (US)

US Size	Diameter in mm	Circumference in mm	AU & NZ Size	HK Size
5	15.7	49	J1/2	11
5.5	16.1	51	K1/2	12
6	16.51	52	L1/2	13
6.5	16.92	53	M1/2	14.5
7	17.35	55	N1/2	16
7.5	17.75	56	O1/2	17
8	18.19	57	P1/2	18
8.5	18.53	58	Q1/2	19
9	18.89	59	R1/2	20.5
9.5	19.41	61	S1/2	22
10	19.84	62	T1/2	23