Offering high security in built-in combination locks, the Master Lock No. 1671 features a deadbolt locking mechanism and is designed to fit almost all locker styles. Ideal for mesh and ventilated lockers with access to the back of lock, the manual action requires the dial to be turned to relock the door. Five different pre-set combinations available for a longer, useful life in your facility. Standard key control used for combination changes, allows quick supervisory access.