The 1658606-1 is a 50-way 3-row IDC D-sub Receptacle for flat ribbon cable. It has gold-plated phosphor bronze contacts and 4-40 UNC threaded inserts. This Amplimite HDF-20 series low profile connector comes with tin-plated steel shell, thermoplastic housing and tin over nickel plated solder tail. It accepts 28 to 26AWG wire.