These locks have some sort of unique application in the context of chastity. Many of them allow both a solo participant or partners to use these locks in creative ways to either solve some sort of restriction or enhance the chastity experience in some way.
These locks are used so that the submissive can be locked and only be allowed out once he or she has the combination. Additionally, one could use these locks to put a "time barrier" on their chastity lockup so they would have to potentially guess every possible combination. In addition, one could use these locks for long distance chastity, which is better explained in the Games & Ways to Play section.
These locks allow the keyholder to not be present while keeping the submissive locked. He or she can reset the combination to a number they see fit and lock up the submissive. If the Dominant or submissive are going to be apart, this allows the Dominant to let the submissive out by sending them the code. Additionally, the submissive may try to guess the combination, but this involves up to 1000 guesses of the combination. To add to this, the Dominant may add vaseline to the number dials to make it much more difficult to guess these numbers. If the submissive can guess 1 combination every 3 seconds, the submissive must dedicate about an hour to trying to get out.