... : Galvanized SteelThickness:1.2mmDeep: 1-1/2"Size: 4" X 4" X 1-1/2"Knockout:Side:12*1/2"; Bottom:3 ... : 4S Box, 1900 box, 1900 electrical box, 1900 junction box, conduit box, J-box, concentric box, conduit junction box, outlet box, drywall mud box, standard 1900 box, square conduit box, 4” square box ...