Deadbolt door locks are the most secure type of key lock and are commonly used on exterior house doors. Single and double cylinder locks are classified by strength from Grade 1 to Grade 3. Grade 1 is the highest and provides the best security.

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. The internal components are engineered to withstand manipulation attempts, ensuring your lock remains impenetrable.

High security locks traditionally offer a very high number of real and theoretical key differs to prevent cross keying and allow for complex master keying configurations. Almost all high-security locks have components designed to resist manipulation from lockpicking and decoding attacks.

The key serves as a security token for access to the locked area; locks are meant to only allow persons having the correct key to open it and gain access. In more complex mechanical lock/key systems, two different keys, one of which is known as the master key, serve to open the lock.