The CRL PR40DP Wide Drop Plate is intended for use with our PR40 Surface Mounted Door Closers. It provides a solid mounting surface for the closer body when clearance or mounting surface is limited. Suitable for top jamb mounts when overhead ceiling clearance is less than 1-3/4" (44.5 mm) or to provide clearance for a surface applied stop or holder. This drop plate will permit parallel arm installations when the door rail is less than 2-1/2" (64 mm) high.