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A lever handle is a lock design that uses flat pieces of metal and a bolt as locking components. In this article, ‘lever lock’ does not mean a locking lever handle incorporating a cylinder locking device. In most designs, the position of the levers prevents the bolt from retracting. When positioned properly, a gate in the lever allows the bolt to move . Lever locks are historically one of the most popular lock designs, but use has declined as less expensive pin-tumbler locks have gained popularity. Lever locks are popular in Europe , eastern Europe, and some parts of South America, as residential and commercial door locks and on safes.