CISA ASTRAL S BRITISH STANDARD APPROVED CRIME PREVENTION CYLINDER LOCK
Bump Resistance / Pushing Resistance
CISA cylinders have a cam that protrudes from the cylinder body, to anchor them more firmly to the lock. This projecting cam, in addition to anchoring the cylinder more securely, also prevents it from being dislodged by a hammer blow.
Depending on the model, CISA cylinders incorporate one or more steel components designed to delay and protect against the performing action of a drill.
Intruders use lock picking tools to simulate the action of a key. Some high-security CISA cylinders have a design and pin configuration pattern that is specifically made to resist manipulation by a pick.