Sliding door center lock assembly for a Multipoint lock with upper and lower attachments.
The center lock has only 1 locking point. Lower and upper attachments are added for 2 or 3 point lock.
The Sliding door lock has holes in the faceplate for the hooks to fit into.
The hooks are on the door jamb frame.

Backset: 1-11/16" (1.692" actual)
Overall Faceplate Length: 45-7/8"
Faceplate Width:  25/32"

Related Sliding door parts:
40220 - Sliding door Lock 45mm backset
40221 - Extension for 40220

 

How to Rehand an Ashland Multipoint Lock (Marvin Doors)
 

 
Rehanding Ashland Multipoint Locks