Width：1 inch=25.4mm
Width/mm	Width/inch
0.2mm	1/16"
3.5mm	1/8"
5mm	3/16"
6mm	1/4"
9mm	3/8"
13mm	1/2"
16mm	5/8"
19mm	3/4"
22mm	7/8"
25mm	1"
28mm	1-1/8"
32mm	1-1/4"
38mm	1-1/2"
50mm	2"
57mm	2-1/4"
59mm	2-3/8"
63mm	2-1/2"
75mm	3"
89mm	3-1/2"
100mm	4"