The 4 MM Stackable Banana Plug is a type of connector commonly used in electronics and electrical applications. The plug features a banana-shaped body made from metal or plastic, with a diameter of 4mm that is compatible with a wide range of equipment. The stackable feature of the plug allows multiple plugs to be connected together for easy and efficient testing and measurement. The plug is typically used for low-voltage applications, including audio equipment, test and measurement equipment, and electronic circuits. 4 MM Stackable Banana Plug provides a reliable and easy-to-use connection, making it a popular choice for professionals and hobbyists alike.