DC Power Plug Tip G56.
Male Side Connector Size: 5.5 x 2.1mm
Female Side Jack Size: 4.0 x 1.7 mm
This DC Power Plug Tip back end is a female connector
that can plug to a round shape 4.0mm (outside diameter) x1.7mm (inside diameter) male connector like this:
Another end is a round shape 5.5x2.1mm male connector that can fit DC input power jacks
of a lot of devices.
Overall Rating for DC Power Connector Plug Tip (5.5x2.1mm) - G56