Features: Aluminum splices are dual rated to accommodate both copper and aluminum wire; Barrel is designed with an internal chamfer at the wire entry to ensure smooth insertion of the wire; Electro-tin plated unless otherwise specified to reduce galvanic corrosion (bimetallic) and resist corrosive elements; Clearly marked with wire size, die index, color code, and crimp location bands; Factory pre-filled with PENETROXTM Type A13 oxide inhibitor; Color coded end caps inserted in the barrels to match the die color code and prevent foreign materials from entering the barrel