Features2 in x 1-1/2 in one bolt, three piece, bi-metal connector allows splicing of aluminum conductors to copper conductorsIdeal when splicing aluminum conductor off vents to main copper conductor runEliminates the need for an additional connectorOne 5/16 in x 1-1/4 in stainless steel pressed bolt assures a positive electrical connection and a damage free installation when properly installed on a membrane roofBi-metal materials manufactured from copper and aluminum alloysRecommended installation tool 1/2 in socket wrench, end wrench or nut driver