Tripp Lite 4-Post Rack Fixed Heavy Duty Toolless Mount Shelf SRSHELF4PHDTM Ideal for adding extra flat surfaces or shelf space in 4-post rack enclosures Supports a load of up to 250 lb 25.5 inch shelf depth (fully closed) / 40.75 inch shelf depth (fully open) Vented design increases airflow to sensitive equipment Accommodates tower units, monitors, and other equipment Heavy-duty, cold-rolled steel construction with black finish Snap-in tool less mounting 5-year warranty