Easy to install, it is operated by no tools. Just plug and play, and then finished. Different wires are managed separately, different diameters can be safely connected. Built-in test point, electrical test no need to remove tape. Instead of traditional electrical tape and twist-type electrical butt connectors, technological innovations reduce wiring time by more than 50%. They are ideal for removable connections because soldering does not need to occur. Suitable for copper wires of size 0.084mm / 2812 AWG. Connect any combination of solid, stranded, and flexible copper wires faster and more reliably. If you need to change other wires, you just need to lift the small lever and remove what you need and replace it, which is very convenient. Made from the best flame-retardant insulating material Nylon PA66. With the advantages of long service life, corrosion resistance, aging resistance, high pressure resistance, insulation, and flame retardancy, it can effectively prevent electrical leakage. Lever nuts are therefore safer than traditional metal nuts. The internal spring contact is made of copper material, special surface plating to prevent oxidation, low resistivity, and better conductive properties. The spring clamping technology is reliable and does not fall off. Since the clamping force can be automatically adjusted with the conductor thickness, the conductor contact is reliable and is not affected by the installation technology. Widely Application: It is widely applied to building wiring, such as used to control multiple lights by one switch. It is ideal for compact and complex applications. Package Includes: KV439 Lever-Nut Wire Connector X 4PcsWelcome to meet