Description:5.5mm x 2.1mm DC Power Jack & BNC Adapter Set is used to connect two CCTV camera cables together. Perfect for adding extension cords to existing cables. Nickel-plated adapters for smooth connections, corrosion, and rust resistance. Specification:Connector Type: 5.5mm x 2.1mm Male-Male, BNC Female-FemaleInstallation Type: Solderless typeSurface Treatment: Nickel-platedDC Connector Size: 43 x 12mmBNC Connector Size: 32 x 9mmPackage Includes: 5pcs - 5.5mm x 2.1mm Male-Male DC Power Jack5pcs - BNC Female-Female Adapter