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.

The earliest patent for a double-acting pin tumbler lock was granted to American physician Abraham O. Stansbury in England in 1805, but the modern version, still in use today, was invented by American Linus Yale Sr. in 1848.