This Corner Shower Seat is a heavy-duty, stay-in-place, molded plastic form that is easily installed and tiled the same day. For use in both new construction and retrofit installations, the full size Goof Proof Shower Seat has a 30 in. wide front with 22 in. sides. Guideline indentations on the top surface make it easy to trim the seat to a 24 in. wide front with 17 in. sides. The vertical front face has a 3/16 in. wide tile support ledge to hold up tiles and to aid in positioning. 2 bubble levels indicate that proper built-in drainage slope is maintained during installation. Rated to a 400 lb. weight limit with all screws, anchors, shims (to compensate for out of square walls, if necessary) and illustrated installation instructions included