With the ASSA® Desmo Precision Drive™ System, locking pins are moved mechanically by the side cuts on the key. Once all the pins are properly aligned, they create two channels for locking side bars, which interlock the cylinder housing and inner cylinder. As the key turns the inner cylinder, the side bars are forced into the unlocked position, which allows the cylinder to turn. As the lock is operated, the side bar pins hold the key in place. This minimizes wear on the key and the pins. As the key is withdrawn in the locked position, the side bar pins mechanically force the side bars into the locked position. This provides a clear path for key removal.

Key control is a major advantage of ASSA®Desmo maximum security protection. ASSA® Desmo keys are patent protected and can only be duplicated by authorized factory locations, dissuading attempts at unauthorized key-duplication. The key is 30 percent thicker than most other high security keys used today. The keys are constructed from solid nickel silver for lasting durability, with no deep cuts to weaken the key. The large key grip provides easy handling and adequate space for the stamping of information for easy identification. This key is backed by a lifetime key breakage warranty. This key profile is factory restricted and corresponds to key security Level 4.