Abstract: Embodiments of the invention are directed to a system of pre fabricated steel panels and associated components. Panels may be locked together via a hem lock tongue of a second panel being inserted into a hem lock groove of a first panel. The second panel is then hinged within the hem lock groove, which automatically aligns the first and second panels. The panels may then be inserted into top and bottom tracks. The panels may have tabs on them that cooperate with formations in the top and bottom tracks to automatically lock the panels into the tracks.