The Adir File Hanging Clamps are the perfect tool for a filing system's effectiveness. These hanging clamps are designed to hold large documents such as blueprints, layouts, maps, and drawings. Each clamp can accommodate up to 100 sheets or 20 pounds. Plus, it can be used with Adir, Mayline, Alvin and Safco file racks.The Adir File Hanging Clamps are constructed of strong and sturdy aluminum with solid steel silver wing knobs. They also include transparent label holders that make file retrieval and identification easier.