23 inches Deep 4 Post Rack. Independent adjustable front and rear mounting rails can be adjusted while the rack is secured to the floor. Printed rack space identification on all equipment rails allows for quick location of rack spaces. Speeding installation of rack mount items (Shipped numbers up per TIA66 specifications. Can be set to number down by flipping the rails). Rack is UL listed for 2, 5 pounds load rating. Rear rail construction provides a clear ventilation path for side ventilated switches. Multiple mounting holes in top flanges for securing ladder rack. Weld nut construction eliminates the need for a second wrench increasing speed and ease of assembly. Multiple mounting locations for vertical power strips on any of the four posts or on the adjustable mounting rails. PatchRunner and NetRunner Vertical Cable Managers mount directly to the 4-Post Rack at any of the four corners to provide a flexible end-to-end cable management solution. Paint piercing washers included to electrically bond rack for simplified grounding.