4 in octagon, 1-1/2 in deep boxes with new construction bar hangers and (4) 1/2 in side knockouts and (1) 1/2 in bottom knockouts are installed in ceiling and walls for mounting fixtures, fans, convenience junction boxes or devices. Garvin Industries labor saving brackets allow the box to be mounted directly onto structural members and provide unobstructed path for the conduit and cable installation. GARVIN® Fan Rated Box, (5) Side Knockouts, (4) 1/2 in and 1/2 in NM Cable Clamps Side Knockout, Octagon Shape, 500 lb Capacity, Steel, G60 Galvanized, 1-1/2 in D Dimensions