Features4 in long, four bolt bi-metal connector provides a non-electrolytic connection between copper and aluminum conductorsBrass side accepts all main size conductors up to 17/32 in diameterAluminum side accepts all main size conductors up to 19/32 in diameterFour 5/16 in hex head stainless steel cap screws assure a positive electrical connectionManufactured from high conductivity brass and aluminum alloysRecommended installation tool 1/2 in socket wrench, end wrench or nut driver