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The irrational part of this is that the 'wrench system' is actually sized in 32nds of an inch, and thus would be much easier to comprehend with 'improper fractions'.

4/32, 5/32, 6/32, 8/32 ... etc

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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.

https://www.google.com/search?q=13%2F64%20wrench

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".

The irrational part is using "inch/32" as the unit instead of, say, millimeters.

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