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2. Arrow lock - Wikipedia

   en.wikipedia.org/wiki/Arrow_lock

   An arrow lock is a lock with standard dimensions used by the United States Postal Service for mail carriers to access collection boxes, outdoor parcel lockers, cluster box units, and apartment mailbox panels. Arrow locks are unlocked through the use of a corresponding arrow key. Arrow locks are also referred to as "Master Access Locks" [1]

3. Tubular pin tumbler lock - Wikipedia

   en.wikipedia.org/wiki/Tubular_pin_tumbler_lock

   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.

4. Skeleton key - Wikipedia

   en.wikipedia.org/wiki/Skeleton_key

   A skeleton key (also known as a passkey [1]) is a type of master key in which the serrated edge has been removed in such a way that it can open numerous locks, [2] most commonly the warded lock. The term derives from the fact that the key has been reduced to its essential parts.

5. Master Lock - Wikipedia

   en.wikipedia.org/wiki/Master_Lock

   Master Lock is an American company that sells padlocks, combination locks, safes, and related security products. Now a subsidiary of Fortune Brands Innovations , Master Lock Company LLC was formed in 1921 by locksmith -inventor Harry Soref and is headquartered in Oak Creek, Wisconsin .

6. Interchangeable core - Wikipedia

   en.wikipedia.org/wiki/Interchangeable_core

   Different from the mechanical lock core, the electronic lock core integrates a miniature electronic single-chip microcomputer, there is no mechanical keyhole, and only three metal contacts are retained. [4] The electronic key is used to unlock the lock. The electronic key needs to set the unlocking authority through the software.

7. Pin tumbler lock - Wikipedia

   en.wikipedia.org/wiki/Pin_tumbler_lock

   A master-keyed [broken anchor] lock is a variation of the pin tumbler lock that allows the lock to be opened with two (or more) different keys. This type is often used for doorlocks in commercial buildings with multiple tenants, such as office buildings, hotels, student accommodation and storage facilities.