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Doug Miller

In article , wrote:
Today, one of our operators mentioned he was missing a special fastener. I asked him if
there was another one I could measure. Sure, he removed it using a 8mm hex key
[...]
So I start to get a clue, go back to my tool box, grab a 5/16 hex key and notice that that
fits a 12 mm shcs fine.

FWIW, 8mm and 5/16" are close enough to the same that wrenches are
interchangeable for most purposes; likewise 16mm and 5/8".