North Carolina Locksmith Practice Exam

Which term defines a master key for all combinations obtained by progressing two bitting positions?

1. Three Pin Master Key

2. Two Pin Master Key

3. Top Master Key

4. Two Column Progression

The correct answer is: Two Pin Master Key

The term that defines a master key for all combinations obtained by progressing two bitting positions is known as a Two Pin Master Key. This concept is particularly relevant in locksmithing, where different pin combinations can be used to create a variety of locks, allowing a single key to operate multiple locks with specific configurations. In the context of a Two Pin Master Key, the idea is that by changing or "progressing" the positions of two pins, the locksmith can generate a range of combinations that the master key can unlock. This method provides enhanced flexibility in key design and lock security, allowing for effective access management in various settings, such as commercial or residential properties. The other choices pertain to different keying systems or configurations. For example, a Three Pin Master Key typically involves more complexity and additional pins, expanding the combination set further, while a Top Master Key is generally a key used in a hierarchy of locks but doesn't specifically relate to the combination of two bitting positions. Two Column Progression refers more to the structural arrangement of key bittings rather than a specific master key configuration. Thus, in the context of the question, the Two Pin Master Key accurately describes the relationship between a master key and combinations derived from two bitting positions.