The Vevor blueprint clamps are built for organizing and securing large-format documents such as blueprints, maps, posters, and artwork. Made from heavy-duty aluminum, each clamp uses a spring-loaded design with a locking knob to keep papers firmly in place without punching or stapling. The 36" length is suited for extra-large drawings, and each clamp supports up to 20 lbs or about 100 sheets. These clamps are compatible with I-shaped racks, R-shaped racks, and wall mount racks sold separately. They are a practical storage solution for offices, construction sites, design studios, and home organization.