Four Pack of Brand New BNC to Phono Socket Adaptors. Excellent Value, 4 pack of BNC to phono adaptors. Suitable for converting a phono plug connection to a BNC plug. Useful for connection to CCTV monitors and to older video equipment which uses BNC connectors. Use of this adaptor converts the BNC video input or output to a phono connection. Phono connecting leads are more generally available and the use of this adaptor facilitates their use. High quality sprung loaded construction. One piece adaptor unit phono female to BNC male.