Bi metallic lugs are specialized electrical connectors used to connect aluminum conductors to copper bus bars to avoid galvanic corrosion that normally happens when dissimilar metals touch one another directly. The lugs consist of an aluminum barrel and a copper palm. The aluminum barrel is fitted on the aluminum cable, and the copper palm is mounted on the copper bus bar. This config... https://www.pioneerpowers.com/bimetallic-lugs-and-connectors.php