Healthcraft Smart-Rail for Box Spring and Mattress Beds 24" x 33" x 6", 300 lbs Capacity, Height Range 31-1/2" to 34-1/2", Latex-free. This Smart-Rail is an innovative bed assist rail designed for persons requiring help for moving, standing and transferring in and out of bed. This bed can unlock and pivot outward to provide better standing support with less reaching and twisting which reduces risk of injury. Fits twin to king size beds. Reduces injury risk as it moves with you to provide support when getting in or out of bed. Independence - It can eliminate the need for assistance for many people. Use extenders to increase rail height from 31.5" to 34.5".