These are extra contact sleeves for the Scotty Black Box voltage controller.
Use them to connect additional downriggers to the Black Box.
Includes a stainless steel contact sleeve for the downrigger cable (mounts on the boom) and a wire lead.
Choose the 4 ft lead model when connecting to a lead at the downrigger.
The 20 ft lead model is useful when connecting to a common distribution terminal for all the downriggers in the system, and then to the Black Box.