Center Drive double hook mortise lock with no anti-slam pin
Designed for Handleset thumb turn in the center of handle.
If your handle has the thumbturn other than center this will not work
Slam retraction hooks point outward
Width: .55 inches
Length: 10.31 inches
Outside screw spacing: 9-7/8 inches
Markings: Patent No. US 7,040,671 B2
Priced and sold each.