Unlike fixed style bed rails the Smart Rail can unlock and pivot outwards to provide better standing and transferring support. Unique o Safety Latch design provides positive locking of rail at bedside and easy unlocking. Lift rail 125mm to unlock for 1 to 3 step transfer in open position. Installs in seconds by inserting the support frame between the box spring and mattress securing with safety straps and adjusting the rail height. Fits conventional box spring and mattress beds. For 8 12 matt mattresses use Smart Rail Leg Extenders to adjust rail height from 30 to 35. Weight capacity 250lbs.