Smart-Rail™ for box spring. Your key to bed mobility and indepedence! For many of us, getting in and out of bed can be quite a chore. The Smart-Rail„¢ is an innovative bed assist rail designed for those of us requiring a little help for moving, standing and transferring in and out of bed. Unlike fixed-style bed rails, our Smart-Rail™ can unlock and pivot outwards to provide better standing support with less reaching and twisting. Works on either side of bed. 32" x 24" (80 x 60 cm). Supports 250 lb. (113 kg).