DC Power Connector - DC Jack - Male - 2.1mm Inner Dia - 5.5mm Outer Dia
This connector is male DC barrel Jack connector which fits with standard 2.1mm DC barrel jack female connector. It's inner diameter is standard 2.1mm while outer diameter of 5.5mm. The moulded plastic casing gives the connector a rugged look. This is a general purpose connector to be used in varity of application where female 2.1mm DC barrel jack is there to receive DC power. This kind of connector is normally found in the wall DC adaptor.
Arduino boards uses female 2.1mm DC barrel jack for external power supply to the board.