I ordered a bunch of theses connectors and have some leftover that I'm offering here.

They are really good to make all sort of connection (by example : a modular configuration of the alim./heated-bed/hot-end).

Each item sold contain the followings elements (as on the first picture) :

4 connectors (two black, two red), 4 contacts and 2 rolls pins (to assemble the connectors)

That's what you need to make a typical connection between two wires (see third picture)