Bose Professional Bose DesignMax DM5C Rough-In Kit (6-Pack)

DesignMax DM5C Rough-In Kit (6-Pack): Six rough-in pans that set DM5C or FS4CE positions before the ceiling goes up. Compatible with FreeSpace FS4CE and DesignMax DM5C loudspeakers.

Bose specifies it for new-construction hard-deck ceilings. It ships under part number 829724-0010 (DesignMax DM5C Rough-In Kit 6 Pack).