Thomas & Betts 54151NV-30 4" Octagon Box With Clamp Thomas & Betts 54151NV-30 4" Octagon Box With Clamp Features: 1-1/2" deep with non-metallic sheathed cable clamps V bracket recessed 1/2" One 1/2" each side conduit knockout 2 each end cable knockouts One 1/2" bottom conduit knockout Steel 15.8 cubic inch capacity 4" octagon box