5.5mm x 2.5mm DC Power Jack to Screw Terminal AdapterAdapts wire leads to coaxial / barrel DC Power Connector.Screw Terminals to 5.5mm O.D. x 2.5mm I.D. DC Power Jack.Features:DC 5.5mm x 2.5mm Jack with marked polarity for the solderless set screw terminals.Center is Positive.No more soldering. A small screw driver is all you need to connect you power leads.Ideal for CCTV security cameras. MPJA 19455 PL