Scx+ high security anti-break, antibumping and anti-pick cylinder. 30-40 brass and double clutch. scx+de:30-40 mcm the mcm scx plus high security anti-break and anti-bumping cylinder has a steel bar and a programmed break system. this system causes the cylinder to break before a violent attack, remaining inside the lock, which prevents attackers from hanging the light bulb and pulling it out. after the break, the light bulb continues to be fully functional, allowing the owner to open the cylinder with their key. contains 5 security keys.