Cylinder locks, commonly known as Euro cylinder locks, are very versatile and can be easily replaced or upgraded without having to change the entire lock mechanism, providing a convenient and cost-effective solution for improving security. These locks typically have a keyway on both sides, allowing for key access from both the exterior and interior of the door. Some Euro cylinders also offer features like anti-snap, anti-bump, and anti-drill protection to enhance security and resist common methods of forced entry. These cylinder locks are available in various sizes and finishes.