Manufactured from high strength steel, front and rear flanges are formed into a tubular box shape and welded to the underside of the shelf on 3" centers for superior strength. Shelf corners are lapped and welded and sides are double flanged. A special design feature keeps clips snug against the shelf regardless of shelf class. Available in four load capacity classes. Sizes up to 48" wide and 36" deep. Shelves are punched to accept accessories such as dividers, label holders, bin fronts and base strips. For use with all Erectomatic posts. Can be independently installed or re-positioned using four one-piece compression clips.