DC Power Plug Tip G21. Connector Size:
5.5x2.1mm (Outside diameter 5.5mm, inside diameter 2.1mm)Connector Shape:
This DC Power Plug Tip one end is a 5.5x21.mm male barrel connector, another end is a female connector
that can plug to a round shape 4.0mm (outside diameter) x1.7mm (inside diameter) male connector.