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Single Cylinder:
A Deadbolt that locks by key on the outside and a turn piece on the inside of the door.
Double Cylinder:
A Deadbolt that locks by key on the outside and inside of the door. **Double Cylinder locks on doors used for exiting a building or a home are a life safety hazard in times of emergency and are not recommended**
One Sided:
A one sided deadbolt locks a door from the inside. These are commonly used on patio doors.
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