Mixing Material Wires Connection: Insulated connectors allow copper wire to copper wire, aluminum wire to aluminum wire, and copper wire to aluminum wire connections, making the insulated connector the best alternative for safely splicing aluminum wire to copper wire Design: The 2 port aluminum wire connectors are specially designed for 4 AWG, 6 AWG, 8 AWG, 10 AWG ,12 AWG, 14 AWG gauge wires. It uses hex screw to fix the wires and comes lubricating oil with antioxidant properties in the ports Product Advantages: Our multi tap connectors are and more convenient than butterfly nut connectors with a larger wire diameter range and higher current, specially designed for those who need easy connection and use Insulation Material: Copper aluminum wire connectors are insulated with high dielectric strength plastic sol for improved chemical protection and wear resistance Safety: The design purpose of aluminum to copper wire connectors is to the safety of aluminum to copper connections and to prevent electrical fires caused by overheating of aluminum wires due to conductor mixing Color: Black Material: Nylon + PVC Package Contents: 5 x Multi Tap Connector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.