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Help Me Choose: Function

Function is defined by the type of door. For example, the added security of a double cylinder deadbolt is desirable for exterior doors that feature a large window.
Single Cylinder Deadbolt

Single Cylinder Deadbolt

Inside locks/unlocks with a thumb-turn. Outside locks/unlocks with a key. Single cylinder deadbolts are typically used with entrance doors that do not have glass windows.

Double Cylinder Deadbolt

Double Cylinder Deadbolt

Inside locks/unlocks with a key. Outside locks/unlocks with a key. Double cylinder deadbolts are typically used with entrance doors that have glass windows.

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