North Carolina Locksmith Practice Exam

In key progression, which option corresponds to a process using four columns of key bitting array?

1. Four Column Progression

2. Five Pin Master Key

3. Change Key

4. Block Master

The correct answer is: Four Column Progression

The process referred to as key progression involving four columns of key bitting array is accurately represented by the four-column progression. This process is designed to systematically arrange key cuts in a manner that facilitates the creation of various keys that will operate a specific lock. In this context, a four-column progression uses four distinct variables or "columns" to define the possible cuts or depth of a key. Each column represents a position on the key, and by manipulating the depths in each column, a locksmith can generate multiple unique configurations. This method not only allows for the creation of several keys for a single locksmithing system but also aids in providing a higher level of security and control. The other options, such as a five pin master key or change key, do not correspond to this specific structural approach. A block master typically relates to a more general type of master keying system rather than detailing progression with a specific number of columns. Thus, the correct choice clearly delineates the four columns utilized in the key bitting array process.