Rings

直径宽度	Circumference	US & CA	EU	UK & AU	SG & JP	HK	CH
14.1 mm	44.3 mm	3	44	F 1/2	4	6	4
14.3 mm	44.9 mm		45	G	5		5 1/4
14.5 mm	45.6 mm	3.5		G 1/2		7
14.7 mm	46.2 mm		46	H	6		6 1/2
14.9 mm	46.8 mm	4	47	H 1/2	7	8
15.1 mm	47.4 mm			I			7 3/4
15.3 mm	48.1 mm	4.5	48	I 1/2	8	9
15.5 mm	48.7 mm			J		10	9
15.7 mm	49.3 mm	5	49	J 1/2	9
15.9 mm	50.0 mm		50	K		11	10
16.1 mm	50.6 mm	5.5		K 1/2	10
16.3 mm	51.2 mm		51	L		12	11 3/4
16.5 mm	51.8 mm	6	52	L 1/2	11	13	12 3/4
16.7 mm	52.5 mm			M	12
16.9 mm	53.1 mm	6.5	53	M 1/2	13	14	14
17.1 mm	53.7 mm			N
17.3 mm	54.3 mm	7	54	N 1/2	14	15	15 1/4
17.5 mm	55.0 mm		55	O		16
17.7 mm	55.6 mm	7.5		O 1/2	15		16 1/2
17.9 mm	56.2 mm		56	P		17
18.1 mm	56.9 mm	8	57	P 1/2	15		17 3/4
18.2 mm	57.2 mm					18
18.3 mm	57.5 mm			Q
18.5 mm	58.1 mm	8.5	58	Q 1/2	17
18.8 mm	59.1 mm		59	R		19	19
19.0 mm	59.7 mm	9		R 1/2	18	20
19.2 mm	60.3 mm		60	S			20 1/4
19.4 mm	60.9 mm	9.5	61	S 1/2	19	21
19.6 mm	61.6 mm			T			21 1/2
19.8 mm	62.2 mm	10	62	T 1/2	20	22
20.0 mm	62.8 mm			U	21
20.2 mm	63.5 mm	10.5	63	U 1/2	22	23	22 3/4
20.4 mm	64.1 mm		64	V		24
20.6 mm	64.7 mm	11		V 1/2	23
20.8 mm	65.3 mm		65	W		25	25
21.0 mm	66.0 mm	11.5	66	W 1/2	24
21.2 mm	66.6 mm			X		26
21.4 mm	67.2 mm	12	67	X 1/2	25	27	27 1/2
21.6 mm	67.9 mm			Y
21.8 mm	68.5 mm	12.5	68	Z	26		28 3/4
22.0 mm	69.1 mm		69	Z 1/2
22.2 mm	69.7 mm	13	70		27
22.4 mm	70.4 mm			Z+1
22.6 mm	71.0 mm	13.5		Z+2