1), Composed of upright frame, beam, and rolling track;2), Designed with rollers, inclined properly.3), The advantage of being gravity feed means that pick faces are automatically replenished. Picking and replenishment sides are separate;4), Speed of through put combined with automatic stock rotation is the major advantage of this system;5), Widely used in workshop, DC transferring center, assembly line to transter the work piece etc.;6), Different size are available;7), widely used in pharmaceutical industry