High security anti-bumping and anti-picking cylinder bps, bumping protection system 30 30 brass. bps: 30-30 mcm the high security anti-bumping and anti-picking cylinder bps, mcm's bumping protection system, includes 6 active pins and passive pins. it has a wide range of sizes and formats: double cylinder, double clutch, with button, medium cylinder, with crown, cylinder for anti-panic doors and electric cylinder for lifts and garages. contains 5 security keys