Cylinder lock for UPVC in Pollachi, Tamilnadu, India is a lock constructed with a cylinder that a locksmith can easily unscrew to facilitate rekeying. The cylinder may contain any of a variety of locking mechanisms, including the pin tumbler lock, the wafer tumbler lock and the disc tumbler lock. Cylinder may be changed without altering the bolt work hardware. This allows the user to have keyed-alike and master-keyed systems that incorporate a wide variety of different types of lock, such as night latches, deadbolts and roller door locks.