The locks are cheaply made and produced OS, they are usually supplied in batches "keyed alike" but if a shop gets a new batch in they most probably won't be keyed alike the the previous batch and some shops may mix batches so just make sure you check them when you buy them, or if you buy from the net request the to be KA or Keyed Alike. They can not be pulled apart and rekeyed to suit a different key or ordered from a key no ( unless you ring around checking every supplier to find one with your previous key number) so order in as much as you think you will need on the one key to start with. You can also order them KD, keyed to differ