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Most door hardware products are design to fit standard door preparation as illustrated on the left. If you have something different, please start with our hardware replacement guide at the link below.
Double cylinder deadbolts are generally used in combination with a keyed door knob or lever handle on exterior doors. These deadbolts are locked and unlocked on both sides of the door with a key, which is a good option for glass-paned doors since an intruder could not unlock the door even if the glass were broken. However, this option is not recommended for most exterior residential doors. If there is an emergency, occupants would have to search for a key before escaping the premises.