Most safes come with different locking mechanisms. They could be electronic, biometric, mechanical, and combination. A CMI Safe, for example, offers products that have the same structure but different locking systems. This is because the best locking mechanisms will depend on its handler. Choose one that can give you the best ease of use. We highly recommend choosing keyless mechanisms to eliminate the risk of losing your safe's access keys. You will also want a re-locker feature that will completely shut your safe during a break-in attempt. A re-locker will securely seal a safe and will take a locksmith to get it to re-open.