OdiySurveil(TM) 20PCS BNC Male Twist-on Coax Coaxial Connector for CCTV Security Camera - Product Name : BNC Male Twist-on Connector,size is approximate as the 3rd product image; - Nominal Impedance: 75 Ohms,Body/housing: Nickel plated phosphor bronze; Contacts: Brass; - BNC locking mechanism, high tolerance fittings; - We only guarantee the quality of our OdiySurveil brand, please look for the OdiySurveil brand to buy(with OdiySurveil Package); - Easy for use, with good quality,adapters for RG59 cable connection.