Strike Plate for Storm Door Mortise Lock.
Does not include the complete handle set trim or any other parts
Commonly used on Storm Doors by Andersen, Pella, Larson, Wright and others.

Measurements:
Screw Hole Spacing: 8-1/16 inch top to bottom screw
Faceplate width: 7/8 inch 
Overall faceplate length: 8-11/16 inch