6 gauge 3/8" stud corrosion-resistant copper lugs. UL Listed and CSA certified.The tin plating on these copper lugs allow them to stay corrosion free even in harsh environments. Seamless copper lug made of 99.9% pure conductive ETP copper. One piece tongue (not sandwiched) make them more conductive than a typical copper lug. Clearly marked for wire size. Features a flared and chamfered barrel to ease application of finely stranded wire or welding cable.