RING MEASUREMENTS

US	UK/AU	DIAMETER IN MM	CIRCUMFERENCE IN MM
2	E	13.3 MM	41.5 MM
2.5	F	13.7 MM	42.8 MM
3	G	14.1 MM	44.1 MM
3.5	H	14.5 MM	45.4 MM
4	I	14.9 MM	46.7 MM
4.5	J	15.3 MM	48.0 MM
5	K	15.7 MM	49.3 MM
5.5	L	16.1 MM	50.6 MM
6	M	16.5 MM	51.8 MM
6.5	N	16.9 MM	53.1 MM
7	O	17.4 MM	54.7 MM
7.5	P	17.7 MM	55.6 MM
8	Q	18.2 MM	57.2 MM
8.5	R	18.5 MM	58.1 MM
9	S	19.0 MM	59.7 MM
9.5	T	19.4 MM	60.9 MM
10	U	19.9 MM	62.5 MM
10.5	V	20.2 MM	63.5 MM
11	W	20.7 MM	65.0 MM
11.5	X	21.0 MM	66.0 MM
12	Y	21.5 MM	67.5 MM
12.5	Z	21.8 MM	68.5 MM
13	Z1	22.3 MM	70.1 MM
13.5	Z2	22.6 MM	71.0 MM
14	Z3	23.1 MM	72.6 MM
14.5	Z4	23.4 MM	73.5 MM
15	Z5	23.9 MM	75.1 MM