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

25.5 30 76 50 127
3/8 10 12 30.5 32 81 52 132
1/2 12 14 35.5 34 86 54 137
5/8 16 16 40.5 36 91.5 60 152.5
3/4 20 18 45.5 38 96.5 72 183
7/8 22 20 50.5 40 101.5 84 213
1 25 22 56 42 106.5    
1 1/8 29 24 61 44 111.5    
1 1/4 32 26 66 46 116.5    
1 1/2 38 28 71 48 122