Good Safety Performance: Made of the best Nylon PA66 flame retardant insulating material. With the advantages of long service life, corrosion resistance, aging resistance, high pressure resistance, insulation and flame retardant, it can effectively prevent electric leakage. So the lever nuts are safer than traditional wire nuts. High Quality Internal Material: Internal shrapnel is copper material, special surface coating to prevent oxidation, low resistivity and better conductive properties. Spring-clamp technology is reliable and does not fall off. Since the clamping force can be automatically adjusted 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, there is no need to use any tools. Just plug and play, then done. Each junction independent shrapnel, different wire managed separately, different diameter can be safely connected. Built-in test point, electrical test without