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The PCB fab you chose will have a list of standard drill diameters,
which the drill tool can pick at any time. Other diameters
will require manual intervention, and you'll pay extra for that.
I often use a 0.35 mm hole with a 0.7 mm diameter annular ring.
If your drawing calls out +/- mil tolerances for PTH's and via's,
your PCB fab can select appropriate hole sizes that match their
standard without upcharging for custom hole sizes.
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