lock cylinders, BKS Detect3 Each lock cylinder contains 3 keys. Hence, if you order for example 4 lock cylinders (simultaneous locking) you get 12 keys with no additional costs. If you want to order separate locking systems for example using 2 separate simultaneous locking systems you have to conclude 2 separate orders. And if you want to order several lock cylinders of the same series make sure to select simultaneous locking at the corresponding length. You can reorder lock cylinders and keys for your locking systems at a later time, provided you have your security identity card as proof of ownership.