RING SIZE CHART

U.S. AND CANADIAN STANDARD	INSIDE DIAMETER  MM / INCHES	INSIDE CIRCUMFERENCE MM / INCHES	BRITISH	FRENCH	GERMAN	JAPANESE
8	18.19 / .716	56.6 / 2.249	P 1/2	56 3/4	18	16
9	18.99 / .748	59.1 / 2.350	R 1/2	59 1/4	19	18
10	19.84 / .781	61.6 / 2.463	T 1/2	61 3/4	20	20
11	20.68 / .814	64.1 / 2.567	V 1/2	64 1/4	20 3/4	23