Threading taps are tools to make threads in holes so it is possible to put afterwars screws inside them. On the other hand, dies are the opposite, tools in order to thread bars or tubes so they look like screws.
https://en.wikipedia.org/wiki/ISO_metric_screw_thread
https://en.wikipedia.org/wiki/Threading_(manufacturing)
https://en.wikipedia.org/wiki/Tap_and_die
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