The Yale 3158 drop plate is for Exposed Back/Narrow Top Rail - The Yale 3158 Molded Full Cover Drop Plate: For use on doors with glass lights where a closer with molded full cover is installed and the back of the closer is exposed. This covers the back of the installation and gives a pleasing appearance from the reverse side.
Finishes:
689 - Painted Aluminum
690 - Painted Dark Bronze