I installed this lockset system on my last property, and love it so much, I’ll never use another. You can re-key an entire house literally as fast as you can walk from door to door! For landlords, this is dream: a tenant moves out, you “change the locks” and the next folks feel secure because they have a new key. The system works with both knobs and deadbolts, so there’s only a single key to the entire house. You pay a bit more up front, but you never have to change the hardware or call a locksmith for an expensive house call!
To re-key, you put in the existing key and give it a quarter-turn. Then, stick the special Kwikset Smart Key tool into the little hole next to the lock’s keyhole. Remove the first key and stick in the new key, remove the tool, and you’re golden! You have to have the working key to re-key, so security is maintained.
Here’s a hint: When you buy a quantity of these locksets, be sure that the lock serial numbers on top of the box DO NOT match. You pick a key from one of the sets, and have dupes made from that. Match the rest of the sets to this key. File the rest away — that way, you have your next master key ready when you want to change the locks.