Crimping Type Aluminum Lugs are connectors that link cables to other cables, surfaces, or machinery. Crimping lugs include the clamps that connect wires to an automotive battery, as well as the ends of battery jumper cables. These are the cheapest because they do not have any insulation and are merely one piece. Crimping Type Aluminum Lugs are used for non-insulated terminals. They are tin-plated to prevent corrosion and are made of copper. They are very effective and safe to use.