WORKS FOR: Works for expanding or reducing the equipment mounting depth by 4.4 inches. PRODUCT SIZE: 2U High, 4.4 inches Deep, 1.2 mm Thickness APPLY TO: Works with Server Rack, Network Cabinet and Rackmount Equipment DURABILITY: the extenders feature a solid steel design. Including 8 Sets of M6 Screws and Nuts. LOADING WEIGHT CAPACITY: 20 Pounds for 2 Post installation , 90 Pounds for 4 Post installation.