1-1/2 in x 1-1/2 in two bolt, two piece connector splices perpendicular intersecting standard class I and class II conductors up to 9/16 in diameterTwo 5/16 in x 1-1/2 in stainless steel carriage bolts assure a positive electrical connectionRecommended installation tool 1/2 in socket wrench, end wrench or nut driver