Monster 127771-00 Female RCA to Male BNC Cable Adapter (Discontinued by Manufacturer) High Quality, Low-Loss Female BNC to Male RCA & Female RCA to Male BNC Adapters Prescision machined, 24k gold-plated for maximum signal transfer and corrosion resistance. BNC locking mechanism designed for the easiest, highest quality connection. True 75-ohm impedance for the lowest dB loss and most reliable signal transfer. Specially constructed high-tolerance fittings ensure best possible contact pressure for superior connection.