One Side Plate has a Thumbturn, which can be turned to lock. The second Side Plate locks with a Key. This Mortise lock comes in both 1 3/8” and 1 3/ 4” versions, and comes complete with all mounting hardware.
In the case of Double Converging Doors, ( Two Doors coming together ), you would use One (1)- Keyed Lockset and One ( 1 )- Dummy Set.
Dummy do not actually perform any function. They exist mainly for Double Converging Doors, ( Two Doors coming together ), for Privacy and Keyed Mortise Locks.
This sets come with Two ( 2 ) Side Plates, all mount hardware.
The Dummy matches the Passage, Privacy and Keyed Mortise Locksets.