N1 Hinged-Cover 4.5X5X3 Carbon Steel - Gray. Designed for use as surface-mounted junction box, switch box and cutout box. Bodies and doors fabricated from 16 gauge steel. 3" depth boxes are furnished with formed steel hinged non-removable cover. Various sizes of removable concentric knockouts are furnished on all four sides of standard cutout boxes. Mounting holes on back of box.