Sargent & Greenleaf Vault locks have been the standard vault lock of the security industry for over fifty years. Sargent and Greenleaf vault locks have four combination wheels for 100,000,000 possible combinations, 100% brass wheels for durability and long life, and a brass lever. Gravity operated mechanism eliminates problems caused by spring fatigue. Group 1 versions tested against expert manipulation for 20 man-hours. A variety of attractive dial and rings in several finishes can be used with this lock.