Long Banana Jack is a panel-mount socket for 4mm banana plugs with up to 20 mm (1 inch) long pin. Can be mounted on metal surfaces with up to 2 mm, and plastic or wood surfaces with up to 5 mm thickness. It mounts on a 8mm hole. The overall length is 25 mm.
The socket hole in long banana plugs is closed at the bottom end. There is also a smaller hole on the back end. Internal wiring may be achieved in two different ways. You may insert the internal wire into the back hole and crimp it using a crimp tool or locking pliers. Alternatively you may place the wire between the two internal nuts and tighten the connection by turning the nuts so that the wire will be clamped between the two nuts.
Sold in pairs (One black, one red). Each long banana jack is composed of one tube, one washer, 2 nuts, and 2 insulating rings (front and back).