The pin tumbler lock is the most widely used locking mechanism in the world. You'll find these securing front doors, cars, mailboxes, safes, gun locks,... | By Art of Lock Picking
Pin tumbler - Lockwiki
How to Pick Locks: Unlocking Pin and Tumbler Deadbolts « Null Byte :: WonderHowTo
Pin Tumbler Locks - What they are, how they work, and more