Descriptons:This B1 4mm Speaker Banana Plug is convenient and reliable ,pure copper with 24K gold plating for maximum signal transfer and durability.Double screws locking to secure the cableEasy to fit for wire size up to 4.0mm.Accept speaker wire:8AWG, 9AWG, 10AWG, 11AWG, 12AWG, 13AWG,14AWG, 15AWG, 16AWG, 17AWG, 18AWG, 19AWG, 20AWGSpecifications:Material: Copper pin and plastic coverSize:Plastic cover internal diameter: 8mmWire hole internal diameter: 4mmPin diameter: 4mmPin length: 37mmTotal length: 45mmPackage Included:4 X 4mm B1 Banana Plug