In more complex mechanical lock/key systems, two different keys, one of which is known as the master key, serve to open the lock. Common metals include brass, plated brass, nickel silver, …

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The meaning of LOCK is a fastening (as for a door) operated by a key or a combination. How to use lock in a sentence.

Solve many security issues with the right lock. A heavy-duty combination lock or a padlock can secure outdoor storage, fences, self-storage units or lockers, keeping your belongings safe.

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4 days ago · Best smart locks of 2025 A simple way to upgrade your security system or add to your smart gadgets in the home is to invest in a smart lock. It allows you to keep track of who …