Simply cut off the cover end to the preferred diameter Soft plastic cover for the rear ends of several D-size chassis connectors Used to protect the gap between connector and cable NEUTRIK SCDR REAR MOUNT PROTECTIVE COVER Soft plastic cover for the rear ends of several D-size chassis connectors. It is used to protect the gap between connector and cable. The protection cover works with all common wires and cables – you simply cut off the cover end to the preferred diameter.