Tripp Lite 19-in Rack Blanking Panel Kit for Enclosure Server Cabinet, 4 Pieces - 19" Components, SRXUPANEL Optimizes cooling of valuable rack equipment Prevents hot air from recirculating through open spaces Contains 4 panels in 4 sizes: 1U, 2U, 4U and 8U Made from heavy-duty cold-rolled black steel Includes mounting hardware Compatible with all standard 19 in. EIA-compliant racks Fills up to 15U of rack space 5-year limited warranty