4Pcs 2 Port Insulated ?Splice Connector Black Interconnect Terminals, 4Pcs ?Product Standard?The dimensions are 2.09"L*1.89"W*1.82"H.Cable application range:Cu 3/0-6AWG?CU9AL 600V ,90C,temperature range of -49 to 194 degrees F.Pack of 4pcs ?UL Listed?This insulated connector helps to ensure a safe and secure connection between aluminum and copper wires, which can help prevent electrical fires that may be caused by mixing conductors. It is also worth noting that this connector has been UL certified. ?Quality material?The insulation is made of high dielectric strength rubber and vinyl, coated for long-term use. It is suitable for use with aluminum or copper wires and has a built-in lubricant for oxidation resistance. ?Widely used?This connector is designed to safely connect cables in various wiring environments and with different wiring materials, including copper-to-copper, aluminum-to-aluminum, and copper-to-aluminum. ?Simple use?Our insulated terminals are designed for easy inspection and troubleshooting. They are internally preloaded with oxidation-resistant lubricants, making them an ideal wiring tool.