Screw-Cover, Type 1, is used in commercial and general industrial applications that require a junction or pull box. It is available in painted or galvanized finishes, with or without knockouts, and in a wide range of sizes. It has a variety of accessories for flush installations and wiring space extensions. N1 Screw-Cover 24X24X10 Carbon Steel - Gray Fabricated from 14 gauge steel. Flat, removable covers fastened with plated steel screws. Cover design permits easy removal without extracting cover screws. Mounting holes on back of box. Removable concentric knockouts on all four sides. Designed for use as a junction box and pull box in commercial and general industrial applications. Flush covers must be ordered separately for flush mount applications.