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Emtek Deadbolts
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Mans need for protection and privacy can be physically traced to an archeologists find of a lock used more than four thousand years ago. Needless to say locks have undergone many changes since then, none more important than the invention of the deadbolt. Deadbolts are defined as a bolt on a lock that is moved by turning a key or knob without activation of a spring. Deadbolts are available as a single or double cylinder, and used almost exclusively on exterior door applications, but can be used as interior locks when added security is required. The only difference between the two types of cylinders is the double cylinder deadbolt is operated by a key on both sides of the door; whereas the single cylinder deadbolt operates with a key on the exterior and a knob or thumb turn on the interior. Double cylinder deadbolts should be used when there is glass in your door or a window is near enough to the door that it could be broken and someone could reach in and turn the knob. In some areas, double cylinder deadbolts are not allowed due to safety issues in the local or state building codes.
