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. * Specifications: Seat Size: 17.75 X 14.75 Seat Height: 18 - 22.25 Base Length: 43 - 44 Base Depth: 18.25 - 20 Max Tub Clearance: 18.5 Back Height From Floor: 32 - 36