These 5.5mm x 2.1mm female DC jack power connector plugs can be used for LED lighting CCTV and various electronics. This barrel connector is the most common connector used for 12V and 24V DC power. Simply loosen screws insert wire and twist the screws shut using a screwdriver. No electrical tape no splicing and no crimping required.Add a 5.5x2.1mm DC connector to any wire. This is the most commonly used barrel jack size for 12V and 24V DC power.Easy screw-on installation clean appearance. No splicing soldering or crimping. Only tool needed is a small screwdriver.Great for LED lighting CCTV electronics and more.