Each lock comes with a set of 2 keys. You cannot mix and match these keys to different locks. For example, Lock#1 has 2 keys, Key#1.A and Key#1.B. You can’t use Key#1.A and Key#1.B to open Lock#2, and so on etc. And yes, I did have to label each and every lock and key so I’d know which keys paired with what lock. Strongly would not recommend these locks, especially for the price I paid for them.