Bnc female jack to rca female jack adapter rca female to bnc female adapter connects bnc male plug to an rca male plug.All metal made with nickel-plated contacts.Snap-on bnc bonding provides a secure, stable connection.Allows to interconnect between different cable inputs and outputs securely transmits bnc audio or video signals to rca good to use with cctv system connector 1: bnc female connector 2: rca female