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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 The Master Lock Solid Brass Padlock comes with a 3/4-inch solid brass body with standard steel shackle and three-pin tumbler security. This single pack is keyed different. Master Lock offers a full line of padlocks, chains, cables, and specialty locks for all of your needs.