niceEshop(TM) 2 Pack 2.1 X 5.5mm Male Dc Plug To 9v Battery Clip Connector Material(External): Plastic. Condition: Brand new. Plug Type: 2.1 x 5.5mm Male (2.1mm inner diameter with 5.5mm outer diameter), 9V Battery Clip. Cable Length: 12cm/4.7". Great for school D&T/home projects for power some lights and LED's.