I just bought a new house and the people that owned it before must have loved having a million keys. The house seriously had about 10 different keys. I was originally going to have them all replaced, but when this guy showed up he said that I can have the locks work with one key! I decided to have them separated into 2 different keys, one for inside and one for outside, and now i have two keys to open up everything in my house! talk about convenient!