Check the listing for details. 10PCS 4mm Banana Male Plug Shrouded Fully Insulated Stackable Connector. Condition: New. Listed at 13.99 USD. High Quality: 4mm stackable banana plugs are made of copper nickel plated which have good electrical conductivity. Shells are made of insulating PA material. Solderless: First pass the bare wire through the gray base. Then through the 4mm jack of the banana plug, then insert the screw from the end of the banana plug, tighten the screw, and finally put on the shell. Suitable for engineers or DIY enthusiasts. Banana plugs are stackable. Perfect for doing testing in schools, homes, laboratories and factories. Stackable banana plugs are made of high quality copper nickel plated material which have good electrical conductivity. Shells are made of insulating PA material. Specification: Material: PA + Copper Nickel Plated Rated voltage/current: 30V/32A. Shipping list: 10PCS stackable banana plugs