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What does a "Depth Key Set" consist of?

  1. A set of keys cut to various depths for duplicates

  2. A collection of old keys for historical reference

  3. Keys arranged by bitting combinations

  4. A set of keys for code original key production

The correct answer is: A set of keys for code original key production

A "Depth Key Set" is specifically designed for code original key production. This set includes precise measurements that correspond to the various depths needed to create keys for specific locks based on their code. Each key in the set is cut to a specific depth and is utilized to ensure that a new key can be manufactured accurately from a given code. This is particularly important in locksmithing as it ensures that the resulting keys will work seamlessly in their respective locks. The emphasis on depth in this context highlights how important accurate cutting is for key duplication and production, which is why this answer is the most suitable. Moreover, a depth key set is not used for merely duplicating existing keys or holding historical references, but rather serves a functional purpose in replicating keys based on coded information.