Adjustable seat rail extension and upholstery with 2 extension easily adjusts from 16 to 18 (patent pending) * Deluxe high strength lightweight all aluminum frame.* Dual axle allows for multiple seat to floor height positions * Adjustable height flip back removable full padded arms * Weighs under 32 lbs. (excluding front rigging) * Over center cross brace eliminates seat guides works with seating and positioning accessories * Adjustable angle back easily adjusts from 5