Ensures correct alignment; eliminates movement between the seat and board. Gives additional confidence and security for users that would normally use a separate bath board and seat together. The frame is adjustable to allow for variations in bath depth and has a backrest for added comfort and support. Seat height is 8". Seat measures 18 x 11 1/4". Board is 9 1/4"W x 27"L. 420-lb. weight capacity.