5.5*2.1mm Solderless Male / Female DC Barrel Jack
This adapter allows hobbyists to connect a barrel jack connector to bare wires. One end has screw terminals and the other has a 5.5x2.1mm, center-positive female barrel jack. If the end user has a power supply with a barrel jack and want to plug it into a breadboard, this might be the simple solution.
The overall length is 38mm