CMC binding post hole size

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I'm finishing an amp and would like to complete the drilling before my binding posts arrive.

Has anyone got these binding posts: (CMC 858-S-AG)
4pcs CMC Speaker Binding Post Silver Plated 858 s AG | eBay

If so, is the hole size 12mm? The listing doesn't say, but I found 12mm on other sites.
Seems big for a binding post, but about right for RCA jacks.. Just want to be sure I don't drill my holes too large!

Thank you
 
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