From		To		To		From
25.4	=	1 in		25.4	=	1 in
mm		scale		mm		scale
10		183		13		144
15		122		21		87
20		91		24		76
25		73		25		72
30		61		38		48
54		34		52		35
80		23		57		32
90		20		73		25
100		18		76		24
120		15		91		20
150		12		102		18
200		9		114		16
250		7		152		12
300		6		229		8
350		5		261		7
450		4		457		4