CEL "Slimline" Mortise Lockset - Used with Steel Security and Storm doors. 

Made by CEL - Can be used as a replacement for the Marks SlimLine series 

Mortise Lock Backset: 1 inch (25mm) 
Deadbolt Throw: 15/16 inch (25mm) 
Faceplate Measures: 7/8 inch by 9-11/32 inch. 
Faceplate Screws: 8-5/16 inches 
Escutcheon Plate: 1-3/16 by 9-13/16 inches 
Escutcheon Plate Screws: 7-7/16 inches 
Handle to Cylinder Spacing: 3-5/16 inches 
The Center of the spring latch to the center of the Deadbolt is 2-5/8 inches. 

Handing CAN BE REVERSED (for Left or Right hand Doors) 
Double Cylinder Rekeyable lock with 2 keys, Kwikset KW1 Keyway. 

Related Lock Hardware: 
301059 - Marks Brand Slimline, 4 finishes 
301080 - CEL Brand Slimline 1 inch (25mm) Backset - Brass 

Note: CEL & Marks have different screw hole patterns.