This assembly provide desk-top access to (19") control and monitor equipment. This model is 16-gauge CRS and include one pair of mounting rails, tapped 10-32, hardware and wiring access below rear door or panel. The 407-15 includes locking rear door with spring-loaded hinge, side vents and optional front door (SFD407) with self-tapping screws. Inside (usable) dimensions are 17 3/4" W x 14 1/8" D.