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, …

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.

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LOCK definition: 1. a device that prevents something such as a door from being opened and can only be opened with a…. Learn more.

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Oct 3, 2025 · Our new top pick is the Schlage Arrive Smart WiFi Deadbolt due to its combination of robust hardware, simple installation and controls, top-tier security, and overall reliability. The …

Lock definition: a device for securing a door, gate, lid, drawer, or the like in position when closed, consisting of a bolt or system of bolts propelled and withdrawn by a mechanism operated by a …

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Oct 3, 2025 · We evaluate the most popular models, installing and testing them in our homes to help you decide which one to buy. With an outstanding 4.5-star rating and an Editors' Choice …

These smart locks make it easy to bring your door online and manage it from anywhere. After testing the best smart locks on the market, these are my favorites.