Heavy Duty Steel Shelving - Modular File Storage SystemCreate instant, organized storage with this heavy duty steel shelving system that eliminates complicated assembly. This sturdy metal shelving features a modular design that lets you stack two, three, four, or five tiers high, giving you the flexibility to start with what you need now and expand your adjustable industrial shelving later as your storage requirements grow. Built to handle the toughest storage challenges, each tier of this metal shelf