5.5 X 2.1mm Plastic Male Plugs DC-022 DC Power Socket Female Jack Screw Nut Panel Mount Connector DC022 5.5*2.1MM
https://www.vogueparade.com/shopping/EN/5/1/1005003367025045/55-x-21mm-plastic-male-plugs-dc-022-dc-power-socket-female-jack-screw-nut-panel-mount-connector-dc022-5521mm//