Bi-metallic lugs are specifically designed to meet one of the biggest challenges in electrical systems: joining unlike metals—most typically, aluminium cables and copper bus bars or terminals. Their patented design has an aluminium barrel for aluminium cables and a copper palm for copper connections, all attached through friction welding for a strong, corrosion-proof transition from o... https://www.pioneerpowers.com/bimetallic-lugs-and-connectors.php