This kit allows you to mount the 270X Outdoor PTZ from a ceiling. The camera itself comes with wall-mount bracket. If you want to have the unit hanging from rafters, a ceiling, etc, you will need this ceiling mount kit.
In addition to using the included 9" mount, this kit also allows you to use standard 1 1/4" PVC pipe for custom lengths. This is often what you find at large department or home improvement stores when they have cameras hanging 10 or 20 feet from the rafters.