SIZE(A)		B		C		N.W.
inch	mm	inch	mm	inch	mm	g/pc
3/8	10	2.1	53	9/32	7	10
1/2	12	2.6	67	9/32	7	20
1/2	12	3	76	5/16	8	30
5/8	16	3.2	82	3/8	10	33
3/4	19	3.6	91	3/8	10	45
1	25	3.7	94	3/8	10	50
1-1/8	28	4.2	107	1/2	12	75
1-1/4	32	4.4	113	1/2	12	76