Here is the set i bought http://www.canadiantire.ca/browse/pr...romSearch=true on sale it was less than $40 and it gets me every bit size from .040" to 1/2" .

as for converters just remember 1"=25.4mm, so 5mm would be 5/25.4=.197" 1mm would b 1/25.4=.039" and so on.