Material : Brass cylinder housing and plug Finish : Bright Chrome, Satin Chrome, Bright Brass,Satin Brass, Bright Nickle, Satin Nickle. Other finish upon request. Mechanism : F16?12-pin profile cylinder is a revolutionary design, it is a modular variation of the pin-and-tumbler design utilizing a 12 pin computer key. It provides pick proof and drill protection. KA, KD, more than a million combinations available. Application : Entrance doors, Bedroom doors, Emergency doors, Office, Garages, Landing doors