Strong Spring Design leibaodan high-quality wire connectors feature a wire range of 22-8 AWG,they are designed to make your electrical work hassle-free and reliable.These Wire Caps are made of metal spring, which is inserted to ensure a stable connection to each application without falling off from them accidentally.Wire connectors grab the wires firmly and make a solid connection, Spring inserts flame retardant housing with good insulation and minimum aging. Well Performance High-quality copper provides good conductivity which can increase the current flow, and decrease the possibility of voltage instability. Our wire nuts can also prevent the failure of wiring and prevent the device from being downtime.They also can prevent wires from contacting other wires or exposed metal surface, doing a great job of rejecting dangerous faults and short circuits. FOR USE WITH COPPER TO COPPER.Do not use on aluminum wiring Widely Applicable, Meeting All Your Wiring Needs Zhejibbang wire nuts connectors sets have a large number of connotations and are very good. They are very suitable for some large factories, auto parts shops, indoor and outdoor environment, cars, and ships. The wire assortment nuts is small in size and easy to carry. There are two different sizes to accommodate different wires. The electric wire caps can change the previous wiring method and bring a safer and more efficient electrical circuit. It is your best choice at work. Installation Instruction 1. Turn off power before installing or removing connectors. 2. Strip wires 1/2"(12.7mm). 3. Pre-twisting unnecessary, hold stripped wires together with ends even Lead stranded wires slightly. 4. Align any frayed strands or conductors 5. Push wires into connector and screw on until two twists are visible in wires.