Lock

The utility model discloses a lock capable of being arranged on a door plate. The lock comprises an outer handle, an outer drive tube, a casing, at least one movable component and at least one bolt, wherein the outer drive tube capable of penetrating through an outer disc set is connected with the outer handle; the casing is provided with an outer surface and a hollow chamber, a drive seat can be received in the hollow chamber, and a lock latch can be retracted by the drive seat under the drive action of the outer drive tube; the movable component is received in the casing; the movable component can be pushed by the bolt to make part of the movable component extend out of the outer surface of the casing. The lock has ideal integral strength, so the lock can not be loosened after used for long time, and locating functions are performed.