I ordered these to terminate CAT6A cables. I am not sure what the 3rd small separator piece is for. There are no instructions. What I did was lay the gold connector with the tab down, open end facing me. Then I lined up the wires per the Ethernet spec. I then inserted the wires into the plastic holding piece. The flat end faces down. After pushing the wires through the holding piece, I cut the excess wires, then inserted the wire and the holding piece into the gold connector, crimped the connector and that was it. I first tested it out on some extra cable I had and then did it on the actual cable. It supported gigabit speed. (That was the fastest I currently have).