This #12820 Drive-In replacement deadbolt latch works on most Weslock Deadbolts made since 1986, including the 300, 400, 600, and many of the decorative lock series.  Drive -in latches are uncommon except in the Pacific Northwest and Upper Midwest.  It DOES NOT have a face plate for screw mounting.   It won't fit Reliant series.  If you are not sure which lock you have, please email me a picture of the lock or latch, and I will help you identify it.  Weslock has changed their drive-in latches to Chrome finish for use with all locks.  If your latch has broken due to door alignment issues, replacing the latch will only be a temporary fix and the door or strike plate must be realigned to correct the real problem, or the replacement latch will fail quickly.  I also stock other replacement parts for Weslock.