Feature:1. The 4mm banana plug extender is easy to connect and use without tool assistance.2. It has good mechanical and electrical properties and long service life.3. Selected highquality PVC materials, fireresistant, flameretardant, durable and durable.4. Banana plug extender, the length is about 42mm, stable connection and high reliability.5. Exquisite workmanship, small and light, suitable for electric power numerical test.Specification:Item Type: Banana Plug CouplerMaterial: PVCPurpose: Electrical Numerical TestColor: Red, BlackModel: U22Length: Approx. 42mm / 1.65inOuter Hole Diameter: Approx. 6mm / 0.24inInner Hole Diameter: Approx. 4mm / 0.16in.Package List:5 x Red Banana Plug Coupler5 x Black Banana Plug CouplerNote:1. Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.