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Crafted in brushed stainless steel and machined to ensure precision fit over wing knobs of all vertical plan file clamps. Hardware is fully compatible with all manufactures such as Adir, Alvin, Lorell, PlanHold, Safco, Mayline, and Brookside Design. This tool is a necessary accessory for any document storage system. Located beneath the removable thermal-set plastic handle is a hexagon hole for removal of broken wing knobs. A maximum of 1 to 1-1/2 turns is all that is required to securely clamp up to 100 sheets of full-size drawing paper. Limited lifetime warranty. US Patent No. 6,098,503. This product is also known as a Plan Wrench, Blueprint Wrench, Clamp Wrench, Plan Clamp Wrench, Print Clamp Wrench, Wing Knob Wrench, or a Hanging Clamp Wrench.
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