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An arrow lock is metal and rectangular, measuring 2.005 in × 3.566 in × 0.620 in (50.9 mm × 90.6 mm × 15.7 mm) with a keyhole in the center. [2] When the user turns the key, a metal bar that normally protrudes from one side is moved through the lock to the other side.
More importantly, this is a key control system for the owner of the key, such as a maintenance person or security guard, to identify keys that should not be freely distributed or used without authorization. Though it is intended to prevent unauthorized key duplication, copying DND keys remains a common security problem.
There often is a special lock box (also called a "key keeper" or "Knox box") located at the outside entrance, which either gives access to a front door key or directly activates the front door electric strike, to allow the mail delivery person to enter the building. A similar "Arrow lock" is usually located on the centralized mailbox, to allow ...
Key control (advantages): Due to the magnetic cylinder elements embedded in the keys, there is a high degree of key control. Unlawful key duplications are minimized by limited access to key blanks (locksmiths) and unique magnetic coding in the key that cannot easily be determined by inspecting the target lock.
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A tubular lock and key. A tubular pin tumbler lock, also known as a circle pin tumbler lock, radial lock, or the trademark Ace lock popularized by manufacturer Chicago Lock Company since 1933, is a variety of pin tumbler lock in which a number of pins are arranged in a circular pattern, and the corresponding key is tubular or cylindrical in shape.
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