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Single Cylinder Deadbolts are generally used in combination with a keyed door ... Single Cylinder deadbolts are unlocked with a key on the outside

 

 

 

From Wikipedia, the free encyclopedia

A deadbolt or deadlock, is a locking mechanism, providing more security than an ordinary key-operated lock because the weight of the locking bar is usually sufficient to increase break-in time to 10 or 15 minutes.[citation needed]

Unlike most spring-bolt locks, in which the bolt is held in place only by the pressure of a spring and can easily be retracted, a deadbolt lock cannot be opened except by rotating the lock cylinder.

A variant of the standard deadbolt is the vertical deadbolt, which generally rests on top of a door. Vertical deadbolts resist jimmying (in which an intruder inserts a pry bar between the door and the frame and tries to pry the bolt out of the jamb).

There are two major types of deadbolt: surface mount and internal. While surface mount deadbolts are easier to install, internal deadbolts provide more security. You can make your home much less attractive to thieves with a few simple tools and a little effort.

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The Ultimate Lock is a premium deadbolt lock system able withstand up to 4000 pounds of pressure and protects against bump keys, helps prevent door kick-ins in Florida

 

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