Inches	MM	UK	US
0.585	14.86	H 0.5	4
0.601	15.27	I 0.5	4.5
0.618	15.7	J 0.5	5
0.63	16.1	L	5.5
0.65	16.51	M	6
0.666	16.92	N	6.5
0.683	16.35	O	7
0.699	16.75	P	7.5
0.716	18.19	Q	8
0.729	18.53	Q 0.75	8.5
0.748	18.89	R 0.75	9
0.764	19.41	S 0.75	9.5
0.781	19.84	T 0.5	10
0.797	20.2	U 0.5	10.5
0.817	20.76	V 0.5	11
0.83	21.08	W 0.75	11.5
0.846	21.49	Y	12
0.862	21.89	Z	12.5
0.879	22.33	Z + 1	13