Good Safety Performance: Made of the best flame-retardant insulating material Nylon PA66. With the advantages of long life, corrosion resistance, aging resistance, high pressure resistance, insulation and flame retardant, it can effectively prevent electrical leakage. So the lever nuts are safer than traditional wire nuts. High Quality Internal Material: Internal shrapnel is copper material, special surface plating to prevent oxidation, low resistivity and with better conductive properties. The spring clamping technology is reliable and does not fall off. Since the tightening force can be adjusted automatically with the thickness of the conductor, the contact of the conductor is reliable and is not affected by the installation technology. Easy to Use: Easy to install, it is no need operated by tools. Just plug and play, and then finished. Every junction independent shrapnel, different wire managed separately, different diameter can be connected safely. Built-in test point, electric test no need to remove tape. Instead of traditional electrical tape and electrical butt connectors twist-type, technological innovations reduce wiring time by more than 50%. Widely Application: It is widely applied to building wiring, such as used for controlling multiple lights by one switch. It is ideal for compact and complex applications. Practical: These are great for removable connections as soldering does not need to occur. Suitable for copper wires size 0.08-4mm / 28-12 AWG. Connect any combination of solid, stranded, and flexible copper wires faster and more reliably. If you need to change other wires, just flip the little lever up and pull out what you need and replace, which is very practical.