Heavy Duty Steel Shelving - Modular Stackable Storage SystemHeavy duty, modular Stackfiles stack quickly and easily to form instant storage systems, without the complicated assembly associated with other file storage systems. The modular design allows you to stack two, three, four or five tiers high. This means you can buy as many file units as you need now and still have the option to add on later. And since they're designed to hold up to 500 pounds per tier, you can fill them with medical records without any