But does anyone say 1/8th centimeter? Seems easier to just drop down to millimeters at that point. Which is fine, but it loses out on the convenience of fractions.
Presumably someone who uses Imperial would say 5/128th inches if they wanted to describe something that's equivalent to 1mm?
25mils ~ 1mm
Or 1/16in as others have said.
1000 mils / 25.4 mm = 39.3
This simple fact still seems wrong to me somehow.