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HEAVY DUTY STEEL - With a brass finish
2 HINGES - Holds up to 75 pounds and 3 HINGES - Holds up to 110 pound
Approved by the New York City Housing Authority (NYCHA) and patented in Taiwan, China and the USA. The foolproof locking device for these double acting spring hinges meets U.S. Federal specification FF-HH-116C (the top button on the hinge is not removable, so that the spring cannot be removed or tampered with). This makes these hinges particularly ideal for use on homes, commercial projects and public buildings.