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@Hoss @Terry

More seriously, in the manufacturing world, inches breaks down really nicely to the limits of what is measurable. 0.0001" is the utmost limit that can be measured with micrometers and obtained with the machines. Trying to adjust the machine by that amount or less is a fools errand. Specialty manufacturing processes, such as bearings, can be made with marginally smaller tollerances.

With metric, it comes out to some weird-ass number that I don't care enough to try to figure out.