1[Safety Banana Plug Set] This kit includes 5 pieces of 4mm stackable banana plug connectors, each insulated for safety and reliability during electrical testing and experiments. 2[Color Coded Design] With red, black, yellow, green, and blue color options, these insulated banana plugs are easy to distinguish and help simplify your wiring tasks. 3[Solderable Wire Ends] Bare wires can be soldered at the end of the banana plug connector, recommended wire diameter of 2.5 to 4mm. 4[Reliable Construction] Crafted from PA and brass with ni plating, these insulated banana plugs are long lasting, ensuring consistent performance for repeated use. 5[Wide Application] Perfect for electrical testing in schools, homes, laboratories, and factories, these solderless banana plugs are ideal for engineers, DIY enthusiasts. 5 x 4MM Safety Banana Plug housings 5 x 4MM Banana Plugs