The 1658688-1 AMPLIMITE HDP-22 series Plugs and Receptacles feature tin-plated steel shells and black nylon inserts with plastic contact retention tines. Plug housings also feature grounding indents. Housings are designed for rear insertion and extraction of precision--formed, crimp-type size-22 contacts - pin contacts for plug housings and socket contacts for receptacles. End cavities at each contact row are number coded (FRONT and BACK) to aid in contact location.