A dead bolt, deadbolt or dead lock is a lockingmechanism distinct from a spring bolt lock because a deadbolt cannot be moved to the open position except by rotating the lock cylinder with the key.
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What is a double cylinder deadbolt?
Instead, the door is locked or unlocked using a thumb-turn style lever. Double cylinder deadbolts or handlesets require a key for locking and unlocking from both the exterior and the interior of the property. There is no thumb-turn mechanism on a double cylinder lock.
What are deadbolts made of?
A door that is equipped with a deadbolt locks by way of the heavy metal rod that connects the lock to the door frame. The bolt is solid, usually made with reinforced steel. Most deadbolts are activated either with a key from the outside or a turn of the lock from the inside.
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