[Closed Design with Double Screws]Banana Plug Audio Connector, 24K Gold Double Screw Lock Speaker Connector for Lifetime with Signal. Isolate the wires and prevent from shorting out, and two set screws the wires are connected securely. [Easy Installation/Material]Banana plugs make speaker wire installation a breeze, perfect for with A/V receivers, amplifiers, surround sound systems, banana wall panels. Material: pure copper, gold-plated, pure copper, non-magnetic. 24k gold plating for maximum signal transfer&durability [Speaker wire suitable for many sizes]Accepts wire size up to 4.5mm. with 8AWG to 20AWG speaker wire. Double screw locking, no welding. High Quality ! Surface plating: plated 24K gold Wiring : double screw fixation, surface welding Access line aperture: 4.5MM Wiring : double screw fixation, no welding Colour:black+silver Material:Metal Package Contents: 20 x Banana Connector 4.5MM Only the above package content, other products are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.