The IncrediBack Rigid is designed for users who need a solid reclininig support in a wheelchair back. The Rigid Back offers adjustability in both height and angle. Reclines up to 30 degrees (must use anti-tip bars when reclined). Fully adjustable for angle and height, with 2" of depth adjustment. Quick and easy installation. (Wheelchair must have anti-tip bars). Comes in six different styles: Incrediback, Incrediback Rigid Back, Incrediback Deep Back, Incrediback Tall Back, Incrediback Rigid Tall Back, and Incrediback Deep Tall Back.