Mortise Lever used on Larson Lifecore Series Storm Door 
 
Special 4-3/4 inch screw hole spacing. 
Inside thumb button to lock handles. (No Deadbolt, No Key) 

Dimensions of Latch Faceplate: 5/8 x 2-5/8 
Backset: 1-3/16 inch (edge of latch to center of handle hole)
Projection: 2-5/8"

Fits doors from 3/4 to 1 inch Thick.

Used on several Larson storm door Models including: 274-FL Fullview, 287-CF, 271-TT, 275-SS & 278-SS Self Storing