Features: Long screw power amplifier terminal, suitable for 4mm banana plugs,spade terminals, or bare wire. Rhodium plated connectors are selected, wear resistance, low distortion, which are firm, durable and not loose, and have good conductivity, not easy to scratch and lasts as new. Carbon fiber housing isolating external pressure, ensuring stable signal transmission. Screw fixing connection mode, welding free, easy to install and use. Suitable for meeting room, home theater, music halls, car audio, power amplifier, speaker and more. Specifications: Material: Copper+Carbon Fiber+Rhodium Plated Color: Black+Red Size: Approx. 66x15mm/2.59x0.59inch Inlet Wire Hole Diameter: 4mm Length of Screw Bolt:8mm Connection Method: welding free/screw fixing Package Includes: 1 Pair Speaker Binding Post note: Please allow 0-1cm error due to manual measurement. make sure you do not mind before you order. Please allow slight chromatic aberration due to different display resolutions.