5.5x2.1mm 5.5*2.5 DC Power Supply Plug Connector + DC-025m Female Metal Panel Mount Socket Jack Plug DC Connectors Adapter
https://www.vogueparade.com/shopping/EN/5/1/1005003380799662/55x21mm-5525-dc-power-supply-plug-connector-dc-025m-female-metal-panel-mount-socket-jack-plug-dc-connectors-adapter//