VideoSecu 20 Pcs of BNC Male Twist-on Connectors Adapters for RG59 Coaxial Cable 1FV Nominal Impedance: 75 Ohms Used in RG59 CCTV cabling applications Package includes: 20 pcs of BNC male connectors BNC locking mechanism, high tolerance fittings Body/housing: Nickel plated phosphor bronze; Contacts: Brass