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 lock - Wikipedia
How Pin Tumbler Locks Work by bosnianbill
File:Pin tumbler lock-all.JPG - Wikimedia Commons
Key Lock for Sliding Glass Door | Kwikset | Weiser | Restricted Key | Door Locks
How to Pick Locks: Unlocking Pin and Tumbler Deadbolts « Null Byte :: WonderHowTo