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Alexander,
Do you mean just a plain threaded brass insert?
(Please see CAD image below).
These have an external self-tapping thread for screwing into hardwood,
an internal machine-screw thread and a slot across the front so they
can be inserted with a flat-bladed screwdriver (though often it is best to
insert them using a short Phillips or Pan Pozi head machine screw inserted
in them first).
Best Regards
Gary
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