An SD entrance lock with a key is a dependable security mechanism for doors. This type of lock requires a key to either lock or unlock the door, providing enhanced access control and security. It's commonly used in both residential and commercial settings to prevent unauthorized entry. SD entrance locks with keys are available in various designs, compatible with different door types, and often incorporate modern security features for added protection. They are a fundamental component in safeguarding entrances, offering convenience for authorized users while ensuring the premises remain secure against intruders.