A banana plug set is a collection of 4mm single-pin electrical connectors used for terminating speaker wires or test leads. Sets typically include color-coded pairs (red for positive, black for negative) using screw, solderless dual-set screws, or stackable designs for quick, secure plug-in connections.

2 x red banana plug

2 x black banana plug

4mm

Standard Size: 4mm pin diameter fits most audio receiver binding posts and multimeter jacks.
Connection Types: Dual set screws, side-stackable pins, or solderless housing.
Common Materials: Gold-plated or nickel-plated copper/brass for clear signal transfer.
Typical Ratings: Safe for low-voltage electronics up to 30V–1000V depending on insulation and build quality (not for mains power)