55-degree Slant for increased retrieval efficiency. More than double the storage capacity of stationary filing systems. Easy installation with no drilling required. Filing shelves move with ease along ball-bearing tracks with four wheels per carriage. Easy expansion - system grows along with your storage requirements. Choice of: 6, 7 or 8-tiers. All Datum products are covered by a Lifetime Warranty . Datum Vu-Stak BiSlider open shelf medical filing units are designed to use a minimal amount of office floor space while vastly increasing storage capacity and providing your medical office staff with easy accessibility to vital records. Datum Vu-Stak BiSlider filing systems increase storage capacity by converting stationary files to moveable systems requiring only a fraction of the floor space. By eliminating fixed aisles between shelves, more units fit in the same space. Just a light push moves the 36" wide Vu-Stak shelving units along the two-track BiSlider, featuring ball-bearing construction, four wheels per carriage and specially-designed rubber end stops for quiet, smooth operation and cushioning at track termination points. Installation is easy because all Datum shelving is TrakSlider-ready, with pre-punched tops for hassle-free set-up. Part of the Datum TrakSlider Family of ProductsThe modular design of Datum's TrakSlider systems allows for easy expansion as your storage requirements increase. All Datum TrakSlider systems can be reconfigured and added onto at any time without the need to disassemble, relocate, or remove existing files. All Datum TrakSlider track units consist of modular, all-welded steel frame and rail assemblies, flush decking, lateral rolling carriages, and overhead stabilizer and roller assemblies. All TrakSlider carriages include four wheels that ride on a double rail track for an added measure of stability and safety. The TrakSlider's heavy-duty welded steel construction includes an overhead anti-tip mechanism to e