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2. Master Lock - Wikipedia

   en.wikipedia.org/wiki/Master_Lock

   Master Lock is an American company that develops 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 E. Soref and is headquartered in Oak Creek, Wisconsin.

3. Master keying - Wikipedia

   en.wikipedia.org/wiki/Master_keying

   For example, master keyed pin tumbler locks often have two shear points at each pin position, one for the change key and one for the master key. A far more secure (and more expensive) system has two cylinders in each lock, one for the change key and one for the master key. Master keyed lock systems generally reduce overall security. [2]

4. Combination lock - Wikipedia

   en.wikipedia.org/wiki/Combination_lock

   A Wordlock letter combination lock.. A combination lock is a type of locking device in which a sequence of symbols, usually numbers, is used to open the lock. The sequence may be entered using a single rotating dial which interacts with several discs or cams, by using a set of several rotating discs with inscribed symbols which directly interact with the locking mechanism, or through an ...

5. Padlock - Wikipedia

   en.wikipedia.org/wiki/Padlock

   A combination padlock. Combination locks do not use keys. Instead, the lock opens when its wheels are lined up correctly to display the correct combination. A padlock was invented by John I. W. Carlson in 1931 (a patent was granted in November 1934) that has both a combination on one side and a key on the other.

6. Rotary combination lock - Wikipedia

   en.wikipedia.org/wiki/Rotary_combination_lock

   Many combination locks have three wheels, but the lock may be equipped with additional wheels, each with a drive pin and fly, in a similar manner. The number of wheels in the mechanism determines the number of specific dial positions that must be entered to open the lock, so a three-sequence combination is required for a three-wheel lock.

7. Bitting (key) - Wikipedia

   en.wikipedia.org/wiki/Bitting_(Key)

   Bitting is the depth of key cuts on a cylinder key for a pin tumbler lock, often expressed as a number. Bitting also refers to the combination of key cuts on a bit key for a warded lock or lever tumbler lock. The exact geometry of modern keys is usually described by a code system. [1]