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Re: P/e ?
Most PE are Ni-Cu-Zn Alloy, called also German Silver or Alpacca: it's not hard material and you'll easily drill with a good steel/carbon bit: just the bit needs a "mate dot" to not to slip (just do the mate hole with a sharp punch).
Some other PE sets are brass or even Steel: brass is not so hard (but worst than Alpacca to be drilled) but Steel is hard...
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 gio
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