This is a painted diecast inside lock with heavy-duty steel spring bolt. The key cylinder has aluminum face and 5 pin tumbler lock with cylinder ring and will replace most locking mechanisms of this type. The spring will put the deadbolt back into place unless the knob is turned 180 degrees and then it holds it in place. Make sure to test fit the lock and make sure the key turns. If the key does not turn you will need to trim the tailpiece of the lock.