Hanging Blueprint Clamps are a convenient way to store blueprints and large format documents for easy access. Each clamp can hold up to 100 prints or 20 lbs total. Blueprint Clamps feature a secure grip and wide opening jaws for easy loading and removal. Blueprint Clamps are a professional grade, perfect for office and field use. The high quality extruded aluminum is durable while solid wing nuts feature built in stops to prevent accidental falls. Blueprint Clamps feature a plastic label holder with blank card stock so you know exactly what project is stored on your Blueprint Rack. These Blueprint Clamps are compatible with the Alvin®, Safco® and Mayline®, rack systems.