Racks roll directly into refrigerator for quick and easy storage. Natural finish, high-strength, extruded aluminum (6063-T6 alloy), riveted construction. Pass-thru design can be loaded on one side and unloaded from the other for maximum efficiency and convenience. "Vari-Slides" accommodate all popular modules used in the foodservice industry. Made of special extrusion (.1" or 2.5mm thick) with bending support design for heavy loads. Keyholes in uprights on 1.5" (38mm) spacing.