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               Originally Posted by 
              uberthumper  
              Definitely imperial gauges - thousandths of an inch. 25 thou (= 0.025, your biggest gauge) = 1mm (ish).
                You could convert. Personally I'd go and get a set of metric gauges 
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         +1
         
        
 To be honest it wasn't really meant as a question more of a hint.
        
