Can be installed on chairs up to 24" over existing sling back in a matter of seconds. Assembly incorporates side-to-side and vertical adjustability to provide upright stability. Customizable to fit each user's individual needs.   #081537703-Sm 13.5x4.5x6.25"   #081537711-Lg  13.5x6.5x6.25" Latex Free UNSPSC#42192208