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What Is the Key Truck? Locks A lock is used to secure a door, gate or lid in order to prevent unauthorized entry. Its operation is controlled with keys or dials. Locks are available in a broad range of styles and sizes to suit a variety settings. They can be made to meet specific needs. The materials used in locks are tested for durability as well as aesthetics and functionality. Some are made from stainless steel and others are made using copper. The latter is the preferred material for handles and decorative elements due to its durability, corrosion resistance