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A Yale brand rotary combination dial.

A combination lock (or permutation lock, word lock) is a keyless lock that uses a sequence of letters, numbers, or symbols to open the lock. Unlike keyed locks, combination locks require that a user know the proper sequence of characters to open the lock, much like knowing a password for a computer login. A combination lock works by correctly positioning internal components as the sequence is entered, usually through the use of one or more dials.

Combination locks are most commonly associated with safes, but are also popular in low security applications in the form of padlocks. Because they do not have keyholes through which to manipulate internal components, most combination locks are compromised through decoding or bypass rather than picking.


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Rotary Combination Locks

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Electronic Combination Locks

See Electronic Locks

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