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Product Description Master Lock is an American company that develops padlocks, combination locks, safes and related security products. Master Lock was founded in 1921 by Harry Soref, P. E. Yolles, and Sam Stahl. Soref invented and patented a padlock in 1924. Master Lock Headquarters are in Oak Creek, Wisconsin, United States. From the Manufacturer Master Lock Hasps feature hard wrought steel and hardened steel bodies for strength. They measure 2-1/2 inches in length. Hardened steel staples resist cutting and sawing and hardened steel locking eyes provide strong cut resistance. Tamper proof hinges help resist prying. Master Lock offers a full line of padlocks, chains, cables, and specialty locks for all of your needs.