Specially-designed sliding rings lock the seat at each end of the sliding rails * Seat glides smoothly in and out of the bathtub or shower over polished high-strength aluminum tubes * Comfortable molded plastic seat with textured finish * Rust-proof lightweight aluminum construction * Adjustable height to fit user and bathtub clearance * No tools necessary for assembly * Seat Size: 17.75 x 14.75 * Seat Height: 18 - 22.25 * Base Length: 39 - 40 * Base Depth: 18.25 - 20 * Max Tub Clearance: 18.5 * Back Height from Floor: 32 - 36 * Weight Capacity: 400 lbs. *