4U Wall Mount Rack Enclosure - Solid DoorNew Model Exterior Dims: (L x W x H) 13 7/8" x 21 1/4 x 8 3/4" Interior Dims: (D x W x H) 13" x 19 1/4" x 8" Solid steel door with a steel frame and key lock; Solid rear panel with mounting holes Vented side panels, Adjustable mounting rails with mounting screws Punch outs located on the bottom and top panels