This Is the new Key Control Deadbolt. This is the lock for you if you run an apartment building or have rental property. So before i explain why this crazy looking thing has 2 places for a key to go in, let me first explain how the new smart key cylinders work.
A couple years ago Kwikset invented the new smart key cylinder. Now what is so great about this cylinder is that any average person can change the lock so that it works with a new key. It only takes about 30 seconds and you dont even have to take the lock off the door. You just insert your key, turn it to the right, press the little tool that comes with the lock into the little hole, pull out your key (while the key is still sideways) and put in your new key and turn it to the left. DONE!! Thats it, the old key no longer works, and the new one does.
Ok so sounds great, but the problem with that lock cylinder is that you can not master key it. That means have 2 different keys work in the same lock. So good for the normal home owner but not for the guy renting out houses. So what Kwickset invented is this little wonder. There is a cylinder on the bottom of the lock that looks normal, but when the landlord needs to use his master key he uses the little tool for changing the lock to spin the cover plate over to show the cylinder that works on there master key.
Here is a link to Kwiksets site, where there is a little video to show it in action. http://www.kwikset.com/keycontrol/ After you see the video and you decide that you might want one, call us here at Bright Lock & Key at 586-991-1274