4 Post Flush Mount Storm Door Lever Set, 1 inch Door - Polished Brass Exterior, Black Interior

This lock will replace the old style 3 post used by Gerkin, Emco, Stanley and others.
The Screws are for the 1 inch thick door.
The new style has 4 posts on the Outside Brass Handle.

Type: Flush Mount storm door handle
Screw Posts: 4, Machine threaded
Screw Post Spacing: 1-3/4 inch for handle and deadbolt - 5-1/2 inch top to bottom screw
Door Thickness: 1 inch thick door

Installation instructions from the manufacturer can be found here