I believe that sheet metal and wire gauges differ between USA and UK. I have no idea about Canada but I would assume that they use the US standards. In the UK we have gone totally metric now and the nearest (very near) to UK 18 gauge is 1.2mm. I find it easy to remember that UK 16gauge is pretty much 1.6mm and 1/16" which is nice and easy to remember. A bit of research with Mr Google might confuse this further !
David
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