 Single Cylinder Deadbolt:
A single cylinder deadbolt locks with a key on the exterior and a thumb turn on the interior. These deadbolts are most commonly used on side doors, back doors, and garage entrance doors along with an entry lock or a passge lock. A single cylinder deadbolt on an exterior door provides added security for your home. |
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 Double Cylinder Deadbolt:
A double cylinder deadbolt is locked with a key from both sides. Double Cylinder Deadbolts are usually used on doors that have glass in them to provide extra security. These locks do not have a thumb turn on the interior, and they can only be locked and unlocked with a key. |
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