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Or just "size 4, size 5", etc, with the "/32" as overall metadata

Except that there are wrench sizes in the /64 range as well.

Rather than 4/32, 9/64, 5/32, you'd have 4, 4.5, 5. That actually seems even better.

And then you can just use millimeters as the unit instead of the awkward "inch/64".