Hi,
From the table I have in front of me (New Zealand):
12mm wire requires a hole diameter of 12.8mm with a tolerance of +0.23mm
1/2" wire requires a hole diameter of 13.48mm with the same tolerance.
11mm wire requires 11.8mm hole with tolerance of +0.20
7/16" wire requires 11.88 hole with +0.20 tolerance
I hope that answers your question.
David
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