The part worth paying attention to here is SmartKey. If you lose a key, hand a key back to a departing tenant, or move into a house whose previous owners are unknown to you, you re-key this deadbolt yourself in seconds with the tool in the box - no locksmith, no pulling the lock off the door. It also gives the cylinder real resistance to picking and bumping, which an ordinary pin-and-tumbler deadbolt does not.

• SmartKey Security lets you re-key the lock yourself in seconds
• Protects against advanced break-in techniques
• Re-keys to any Kwikset KW1 or Schlage SC1 keyway key
• Key operated outside, thumb turn inside; 2 keys included
• 1 in. deadbolt throw; latch has a round corner faceplate
• ANSI/BHMA Grade 3 certified
• Microban antimicrobial protection keeps the hardware 99.9 percent cleaner than unprotected surfaces
• Fits door thickness 1-3/8 in. to 1-3/4 in.; 1 in. cross bore
• Metal body; lifetime mechanical and finish warranty

Tip: Single cylinder means key outside, thumb turn inside. That is what most doors should have - a double cylinder needs a key on both sides, which is a problem in a fire and is restricted by code in some places.