Eightwood 15pcs BNC Female to BNC Female Barrel RF Coax Adapter Coupler 50 ohm for CCTV Security Camera Connector 1: BNC female; Connector 2: BNC female; Impedance: 50 Ohm Brass (Not Alloy) material ensure higher signal transmission and connectivity Adapter with nickel plated for durability and repeated disconnects Application: CCTV security camera Package includes: 15pcs BNC female barrel adapter