Banana plug test leads are made of copper material so they are soft, flexible and nice to work with. Sturdy Banana Plugs and insulation greatly enhance durability and flexibility of the leads. Every electronic techie should have these cables.The tail of the alligator clips can be perfectly connected with the 4mm banana plugs. 5 colors make it easy to distinguish them during testing. Maximum opening: 15mm. Current Voltage: CATII 300Vac/15A.Wire piercing probes can be easily connected with the 4mm banana plug test leads. Perfect for wire piercing. No need to strip off the cables and no damage to the cables. Textured non-slip design enhances your comfort. High reliability and long service life. Probe length: 20mm. Voltage: 30V.Banana plug piercing kit not only for automotive diagnostics, testing and repairing, but also in physics laboratories, schools, homes and industries. It is one of the indispensable tools for engineers.Package include: 5 x banana to banana plug test leads, 5 x alligator clips, 5 x insulation wire piercing probes, 1 x white transparent storage box."