Marks 22AC/3 Left Hand Reverse Iron Gate Mortise Lock Body With 2-1/2" Backset
(Backset: 2-1/2". Mortise Body Only! 1) Lock On Top & Knob On Bottom, or Knob On Top & Lock On Bottom. 2) WHILE OUTSIDE, Lock on Right & Hinges On Left, or Lock On Left & Hinges On Right.