A deadbolt is a type of lock that provides extra security for doors. It consists of a solid metal bolt that extends into the door frame when locked, making it more difficult to force open compared to standard spring locks. Deadbolts are usually operated with a key from the outside and a thumb turn or key from the inside. They come in various styles, including single-cylinder and double-cylinder options. Deadbolts are often used on exterior doors to enhance security and protect against unauthorized entry, making them a popular choice for homes and businesses.

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