Wire Gauge: The 4 port black insulated connectors are specifically designed for 2/0AWG, 1/0 AWG, 2 AWG, 4 AWG, 6 AWG, 8 AWG, 10 AWG ,12 AWG, 14 AWG gauge wires Insulation Material: Dual Entry connectors are insulated with high dielectric strength plastic sol for improved chemical protection and wear resistance Advantage: Aluminum wire connectors can be easily reinserted for inspection and troubleshooting. It uses hex screw to fix the wires and comes with lubricating oil with antioxidant properties in the ports. Aluminum connectors are safer and more convenient than butterfly nut connectors, with larger wire diameter range and higher current Multiple Connection Options: Multi-tap connectors allow aluminum wire to aluminum wire, copper wire to copper wire, and copper wire to aluminum wire connections, making the insulated connector the best alternative for safely splicing aluminum wire to copper wire High Security: The design purpose of electrical power connectors is to ensure the safety of aluminum to copper connections and to prevent problems caused by aluminum wire overheating due to wire mixing Wire Gauge: The 4 port black insulated connectors are specifically designed for 2/0AWG, 1/0 AWG, 2 AWG, 4 AWG, 6 AWG, 8 AWG, 10 AWG ,12 AWG, 14 AWG gauge wires Insulation Material: Dual Entry connectors are insulated with high dielectric strength plastic sol for improved chemical protection and wear resistance Advantage: Aluminum wire connectors can be easily reinserted for inspection and troubleshooting. It uses hex screw to fix the wires and comes with lubricating oil with antioxidant properties in the ports. Aluminum connectors are safer and more convenient than butterfly nut connectors, with larger wire diameter range and higher current Multiple Connection Options: Multi-tap connectors allow aluminum wire to aluminum wire, copper wire to copper wire, and copper wire to aluminum wire connections, making the insulated connector the best alternative for safely splicing aluminum wire to copper wire High Security: The design purpose of electrical power connectors is to ensure the safety of aluminum to copper connections and to prevent problems caused by aluminum wire overheating due to wire mixing