Drop bar, Brackets are bolted or welded to the door and a wood or metal bar rests in the brackets and extends across the door frames., Door chain, A supplemental locking device for residential doors. A chain permits the door to be opened enough for a person within the residence to see and speak to a visitor but still restrict access., Door limiter, Restricts the opening of the door and is similar to the supplemental security locks found in hotel rooms. Consists of a frame-mounted plate with a shaft, knob, and a hinged U-shaped shackle that mounts on the door. , Surface bolt, Manually operated supplemental locking device that can be mounted on most doors and some windows., , Drop bar, , Door chain, , Door limiter, , Surface bolt, Internal-mounted bolt, Flush bolts are installed in the edge of one side of a set of double doors. This permits one side to remain locked while the other door is used for entry and exit. When desired, the bolts can be retracted and both doors opened., , Internal-mounted bolt, Padlock, Portable or detachable locking devices, Rim lock, Mounted on interior doors surfaces and is used as a supplemental lock for doors that may or may not have other types of locks. Turning a thumb-knob on the inside of the door operates the lock., , Rim lock, Electromagnetic locks, Consists of an electromagnet attached to the doorframe an an armature plate mounted on the door. Shutting off the power will release the door. , , Electromagnetic locks, Electronic keyless locks, May have a keypad, card reader, and/or fingerprint-activated screen., , Electronic keyless locks.

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