Hoffman a1066jfgqrr j box, type 4x, solid cover/qr, 9.50×6.00×5.78, fiberglass able to withstand harsh environments, these small enclosures feature a simple, traditional non-metallic design that is suitable for a broad range of applications.compression-molded fiberglass material has excellent temperature and chemical resistance qualities and exhibits outstanding physical properties. Fiberglass material is easily punched, drilled, filed or sawed. Seamless foam-in-place gasket assures water-tight and dust-tight seal. Threaded internal bosses provided for mounting optional panels and terminal block kits. Scratch-resistant polycarbonate windows are permanently bonded in place. Screw-cover enclosures have easily removable covers attached to body with internal plated steel hinges. Cover securely fastens to the body with four captivated type 316 stainless steel cover screws.