4mm Yellow Banana plug

A banana connector (commonly banana plug for the male, banana socket or banana jack for the female) is a single-wire (one conductor) electrical connector used for joining wires to equipment.

Banana plugs offer solid connection and convenience. This 4MM Banana Plug / Charge Plug is High-quality cage spring plugs. The plug body accepts cables up to 4mm diameter.

The plug has one or more lengthwise springs that bulge outwards slightly. It presses against the sides of the socket, improving the electrical contact and preventing the pin from falling out.
When trying to wire speaker cables into the back of a reciever in a cabinet or other tight space, banana plugs offer the convenience of connecting the bare wire out in the open and simply plugging them in the appropriate post.
This also prevents cross termination of stray strands that can overload the system.