3 – Kwikset 985 Double Cylinder Deadbolts – Iron Black Matte Finish – Keyed Both Sides – w/ SmartKey Security. New in Original Box. Check out all the pics. The 985 series deadbolt requires a minimum door thickness of 1-3/4. The 985 series deadbolt with SmartKey Cylinders will work on a minimum door thickness of 1-3/8. Double Cylinder deadbolts are typically used when there is glass within 3′ of the door. A double cylinder prevents someone from breaking the glass and reaching through and opening the deadbolt from the inside. If you choose a double cylinder, have a plan to exit in case of an emergency – you will need a key to exit the house if the door is locked. The 985 deadbolt matches the deadbolt used on the Kwikset Signature Series Double Cylinder Handlesets. SmartKey Security gives you a smart, simple way to re-key your lock Security Made Convenient SmartKey Security features re-key technology, which allows you to re-key your locks yourself in seconds, because we realize the person who has your key today may not be the same person you want to have your key tomorrow. Reasons to Re-key Loaned or unreturned Keys Recently moved, tenant turnover Your child has lost their key, again. You have a different key for each door. Why is a SmartKey Security lock better than a regular lock? It protects against common break-in methods Kwikset’s SmartKey Security is designed to protect against these type of break-ins and keep your family safe. SmartKey Security also allows you to re-key the lock yourself in seconds, leaving lost or unreturned keys obsolete. PICK RESISTANT BUMP PROOF RE-KEY TECHNOLOGY. Keep the security of your home or business top-notch with the Kwikset 985 Double Cylinder Deadbolt in Iron Black. This contemporary-styled deadbolt comes with the hardware and instructions for easy installation. The lock features a removable key cylinder on both sides, making it suitable for double doors, front entrance doors, and residential or commercial properties. The Kwikset 985 deadbolt is made with a cross bore diameter of 2 inches and a throw length of 2 inches, ensuring optimal security. It is also ANSI Grade 1 certified, which means it meets the highest level of security standards. With its universal mounting and reversible door handing, this deadbolt can fit any door. Add an extra layer of security to your property with the Kwikset 985 Double Cylinder Deadbolt.