Replace Your Existing Lock— Lockey 2800 Series Latchbolt Locks can be used to completely replace an existing deadbolt, latchbolt, or just a plain door knob. Just take off your existing door hardware and install one of these in its place. They are designed to easily retrofit onto standard doors.
Use with Your Existing Lock—you can leave your existing lock in place and install this lock either above or below it for added security and convenience. If you do this, people who know your secret code will only be able to enter when both locks are unlocked, perhaps, during the day, for example.
Click to view the Installation Instructions that come with each purchase.