UK	US	EUROPE	INSIDE DIAMETER
Extra Small	J	4¾	49¾	15.49
	K	5¼	50	15.9
Small	L	5¾	51¾	16.31
	M	6¼	52¾	16.71
Medium	N	6¾	54	17.12
	O	7	55	17.53
Large	P	7½	56½	17.93
	Q	8	57½	18.34
	R	8½	58½	18.75
	S	9	60	19.15