Yes, bi-metallic lugs are produced in both insulated and non-insulated forms to meet various installation needs. Typical bi-metallic lugs have an aluminium barrel and copper palm, but with no added insulation on the palm or barrel. Yet, to provide increased safety and dielectric protection, numerous manufacturers also provide pre-insulated bi-metallic lugs. Pre-insulated bi-metalli... https://www.pioneerpowers.com/bimetallic-lugs-and-connectors.php