Traditionally the saddlery trade works in old Imperial measurements, so you will find my leathergoods are all described in inches for length & width. I find it as hard working in millimetres & centimetres as most of you would for feet & inches! So to try & avoid any confusion, here is a conversion table to help work out what you need:-

Inches MM Inches CM Inches CM Inches CM
1/4 6.5 10 25 30 76 50 127
3/8 10 12 30 32 81 52 132
1/2 12 14 35 34 86 54 137
5/8 16 16 40 36 91 60 152
3/4 20 18 45 38 96 72 182
7/8 22 20 50 40 101 84 213
1 25 22 55 42 106    
1 1/8 29 24 60 44 111    
1 1/4 32 26 66 46 116    
1 1/2 38 28 71 48 122