The key parts of a bi-metallic lug include: - Aluminium Barrel: This is the cylindrical part of the lug where the aluminium conductor gets inserted and crimped. Made from high-conductivity aluminium (usually 99.5% purity or higher), the barrel is often treated chemically and filled with conductive grease to keep oxidation at bay and minimize contact resistance. - Copper Palm: Th... https://www.pioneerpowers.com/bimetallic-lugs-and-connectors.php