About this product: These are terminal connectors that can be connected with banana plugs. The material is gold-plated. They can be used for audio equipment, DIY speaker construction, and other similar projects. External dimensions (approx.): Max. W14.5mm, H: 42mm Screw diameter: φ4mm, Clamp hole diameter, compatible with case thicknesses from 5 to 6.8mm (I have used them up to 10mm). Jumper cables: Approximately 40cm x 4 (1 cable without a terminal cover)