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YP AnswersPin tumbler locks are popular because they are relatively secure for most residential applications and generally inexpensive. Since the entire locking mechanism in this device is contained in a single cylinder, pin tumbler locks are also very easy to swap in and out. Most exterior doors on homes and apartment buildings will have at least one of each of these locks. Knob locks are quick to open and can be convenient when minimal security is acceptable, but they are very easily forced open....Read More
YP AnswersEnclosed in a doorknob, these devices contain spring-loaded pins of varying sizes, which must be pushed upward before the knob can be turned to open the door. When the correct key is inserted into a pin tumbler lock, the grooves on the key's blade push the pins up to the precise height needed to allow the inner chamber to turn....Read More