4 gauge 1/4" stud 90 degree 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.