Ltvystore 10Pack 2.1 x 5.5mm DC Power Pigtail Female + 10Pack 2.1 x 5.5mm DC Power Pigtail Male for CCTV Security Camera Center positive 2.1mm DC plug to durable two strip tinned wires Molded male connectors Outside diameter: 5.5mm Inside diameter: 2.1mm easy to maneuver and install, and helps conserve space