This portable Tub/Shower Bench should be installed by property personnel. Clamps must be Tightened and have Legs Perpendicular to the Bench with Feet leveled and locked onto a FLAT Surface. The Feet can NOT rest on the radius of the tub. If your tub does not allow for proper use of this standard Tub Bench, please contact Access-Able Designs for the correct sized tub bench. Toll-Free: (877) 853–7816.