Kwikset Double Cylinder Deadbolt with SmartKey from the 660 Series

Double Cylinder Function: The deadbolt is thrown and retracted by a key from either side. As you will not be able to unlock this from the inside without a key, please check your local fire code to ensure this is allowed before purchasing.

Product Features:

• Equipped with a full 1" throwbolt
• Fully adjustable latch to fit all standard door preparations (2-3/8" to 2-3/4" Backsets)
• ANSI/BHMA Grade 3 Security
• Lifetime mechanical and finish warranty
• Patented side locking bar technology offers improved security by protecting against lock bumping, an attack technique used to defeat conventional pin & tumbler locks.

SmartKey®: 

• This technology allows you to re-key your lock in seconds with 3 simple steps and features stainless steel racks, pins, and side locking bar for increased strength and security.

Specifications:

• Backset: Adjustable for 2-3/8" or 2-3/4"
• Crossbore 2-1/8"
• Edge Bore 1"
• Latch Face 1" x 2-1/4"
• Door thickness: 1-3/8"-1-3/4" doors standard.
• Cylinder: 5-pin SmartKey cylinder, cannot be keyed alike to a 6 pin cylinder.
• Bolt: 1" throw

Additional Functions:

• 660-S: Single Cylinder Deadbolt
• 665-S (This Model): Double Cylinder Deadbolt