The Adir Office 24 in. File Hanging Clamps Package of 6 are designed for blueprints and large format documents. These strong aluminum clamps with solid steel silver wing knobs can accommodate up to 100 sheets or 20 lbs. each. Their transparent label holders make it easy to find what you’re looking for. Fits all Adir, Mayline, Alvin and Safco racks. Strong, sturdy aluminum clamps. Label holders for easy identification. Attractive and professional looking.