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Key-operated multi-point locking system As with the 5 lever mortice deadlock, these types of door locks need the key to lock and unlock the door. But the difference is a multi-point locking system locks the door at the top and bottom as well as the center Lever - Bolt with extra hardware, enabling Glass filled Thermoplastics ENGINEERING GRADE GLASS FILED THERMOPLASTIC BLACK FLAT RODS Although there are many types of locks, the four most common are padlocks, deadbolts, knob locks, and levers..