We have been asked on several occasion for a simple conversion chart of Millimetres / Centimetres to Inches.
Hopefully the conversion chart will help 



(0.7cm)   7mm      >   0.28"
(1cm)     10mm     >   0.39"
(1.2cm)   12mm     >  0.47"
(1.5cm)   15mm     >  0.50"
(2.5cm)   25mm     >  1"
(3.5cm)   35mm     >  1.37"
(5cm)      50mm     >  1.96"
(10cm)    100mm    >  3.94"

These measurments are approximate and are primarily used to give you an idea of the widths.