Mortise dimensions 6" X 4" X 15/16".
Front plate mortise dimensions 8" X 1-1/4"
7-1/4 inch mounting screw centers.
When facing the door from the outside (always locked) door swings into the house, hinges are inside on the left.
This lever set does not use a key it is always locked on the outside.The inside is always open.
Great for areas which only need one way exits while the outside is always locked.
Mid century modern.