Of those 32 possible keys, only two keys need to be made. That is 2 x 2 x 2 x 2 x 2, or two to the fifth power (2^5), which equals a total of 32 possible unique keys. If each one of those stacks has a master wafer, then each chamber will have two possible shear lines. Say there are five chambers in the lock and five active pin stacks. This can work to create a number of possible keys. However, the property manager will have one key that works for both locks. In the example of a property manager, one tenant’s key will work on their lock but not on the neighbor’s lock. When a master key system is finished there may be a graduated level of access. A master key system will allow for different levels of restricted entry. Similarly, these institutions would like to restrict access based on an individual’s standing, and responsibility, within the establishment. ![]() Most large institutions do not want their employees to carry around large quantities of keys.
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