Bimetallic lugs are available in different types and shapes to fit different electrical uses, providing flexibility and compatibility with different cable and busbar configurations. Usually, these lugs are an aluminum barrel soldered to a copper palm through friction welding, but the design can be different depending on the number of holes, palm shape, and the connection type. Comm... https://www.pioneerpowers.com/bimetallic-lugs-and-connectors.php