Deadbolt. This lock type is considered to be the most secure one. These locks are sturdy and really hard to break. They can be single-cylinder or double-cylinder.

3 star cylinder locks are designed with anti-pick mechanisms, making it incredibly difficult for even the most skilled lock picker to manipulate the pins successfully.

A pick-proof lock is a lock with specialized keys and safety features that prevent lock picking and bumping. The best pick-resistant locks to buy are the Medeco3 Cam Lock, BiLock deadbolts, and the EVVA MCS locking system.

As such, some people take the two as a symbol of freedom and confinement. Others see them as symbols of closing one chapter in their life and opening another. Key pendants have been given as gifts for many years.