The Master Lock Company, founded in 1921 by Harry Soref in Milwaukee, Wisconsin, is a leading manufacturer of padlocks and security products. Soref's innovative design of the laminated steel padlock, patented in 1924, set a new standard for strength and affordability. The company quickly grew from a small workshop to a significant player in the security industry, especially during Prohibition when it supplied large quantities of locks to federal agents.

Master Lock's core product line includes laminated steel padlocks, combination locks, and high-security pin tumbler padlocks. These products are widely used in various settings, including schools, hospitals, offices, and military applications. The company also offers a range of security solutions for both consumer and commercial needs. With a history of reliability and quality, Master Lock has established itself as a trusted name in security for over a century.