***Material: The main shaft is pure copper gold-plated, the nut and the gasket are gold-plated iron, environmentally friendly plastic. ***Shape ：Color coded plastic insulation jacket, for easier recognition，Easy to use ***Connection method: with 4mm banana plug connection, it can also be directly crimped. ***Hole Dia :Overall length 42mm, screw shaft diameter: 5mm, foot pitch 19mmCan be installed on a panel within 5mm. ***Exquisite appearance, compact, simple to use, easy to carry Double Row Banana Socket，Traovien Banana Plugs One Couple, Terminals Red Black Connector Amplifier Terminal Binding Post Power Amplifier Dual Copper 2-Way Banana Plug Jack(2Pcs)