BKS cylinders are standard delivered with three steel keys made of a heavy quality. The cylinder has 5 locking pins and offers a SKG** certification both sides of the cylinder has a skg certification. Profile cylinder double PZ88 SKG** brass nickel plated incl. 3 steel silver keys with double sided drilling obstruction. different keyed and equal keyed available. If equally closed please take into account a short delivery time: Comes with danger function / hotel function: means that if on the other side a key is unexpectedly inserted, the cylinder can still be operated on the other side. Ideal for use of motor cylinders and or in case of care and calamities.