Template:POTD/2004-07-25
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The pin tumbler lock is a lock mechanism that utilizes a group of pins of varying lengths to prevent opening the lock without the correct key. Pin tumblers are most commonly employed in cylinder locks, but may also be found in tubular or radial locks.
When the correct key is inserted, the gaps between the key pins (red) and driver pins (blue) align with the edge of the plug (yellow).Photo credit: Eric Pierce
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