Circumference		Diameter		Europe	UK and Australia	United States and Canada	SG/JP	HK	CN	Switzerland
(mm)	(inches)	(mm)	(inches)
44.2	1.74	14.1	0.56	44	F1/2	3	4	6	6	4
44.8	1.77	14.3	0.56	45	G		5			51/4
45.5	1.79	14.5	0.57		G1/2	31/2		7.5	7
46.1	1.82	14.7	0.58	46	H		6			61/2
46.8	1.84	14.9	0.59	47	H1/2	4	7	9	8
47.4	1.87	15.1	0.59		I				9	73/4
48.0	1.89	15.3	0.60	48	I1/2	41/2	8	10
48.7	1.92	15.5	0.61		J					9
49.3	1.94	15.7	0.62	49	J1/2	5	9	11	10
50.0	1.97	15.9	0.63	50	K					10
50.6	1.99	16.1	0.63		K1/2	51/2	10	12	11
51.2	2.02	16.3	0.64	51	L					113/4
51.9	2.04	16.5	0.65	52	L1/2	6	11	13	12	123/4
52.5	2.07	16.7	0.66		M		12		13
53.1	2.09	16.9	0.67	53	M1/2	61/2	13	14.5		14
53.8	2.12	17.1	0.67		N				14
54.4	2.14	17.3	0.68	54	N1/2	7	14	16		151/4
55.1	2.17	17.5	0.69	55	O				15
55.7	2.19	17.7	0.70		O1/2	71/2	15	17		161/2
56.3	2.22	17.9	0.71	56	P				16
57.0	2.25	18.1	0.71	57	P1/2	8	16		17	173/4
57.2	2.25	18.2	0.72					18
57.6	2.27	18.3	0.72		Q
58.3	2.30	18.5	0.73	58	Q1/2	81/2	17	19	18
58.9	2.32	18.8	0.74	59	R					19
59.5	2.34	19.0	0.75		R1/2	9	18	20.5	19
60.2	2.37	19.2	0.76	60	S				20	201/4
60.8	2.40	19.4	0.76	61	S1/2	91/2	19	22
61.4	2.42	19.6	0.77		T				21	211/2
62.1	2.45	19.8	0.78	62	T1/2	10	20	23
62.7	2.47	20.0	0.79		U		21		22
63.4	2.50	20.2	0.80	63	U1/2	101/2	22	24		223/4
64.0	2.52	20.4	0.80	64	V				23
64.6	2.55	20.6	0.81		V1/2	11	23	25
65.3	2.57	20.8	0.82	65	W				24	25
65.9	2.60	21.0	0.83	66	W1/2	111/2	24	26	25
66.6	2.62	21.2	0.84		X
67.2	2.65	21.4	0.84	67	X1/2	12	25	27.75	26	271/2
67.8	2.67	21.6	0.85		Y
68.5	2.70	21.8	0.86	68	Z	121/2	26			283/4
69.1	2.72	22.0	0.87	69	Z1/2
69.7	2.75	22.2	0.87	70		13	27	30
70.4	2.77	22.4	0.88		Z+1
71.0	2.80	22.6	0.89		Z+2	131/2