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12mm is very close to 1/2". Also, 19mm is very close to 3/4". If the heads are these sizes its very easy to use imperial tools on them.
A metric drill bit set would be a good idea. However, I've always been able to just print a nice snug fitting hole for almost all my 'threaded' holes. This is just the smallest hole I've ever had to do that with. I did test print it a couple of times, but I probably could have tested it once more!
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