OWM Series
RIB Series
Rough In Bracket

Rough in brackets are installed before the sheetrock is installed, so they are only used in new construction. Their primary purpose is to indicate to the sheet-rock installers where (and what size) to cut holes for the speakers. They are optional. If not used, you must secure the speaker wire in place between the studs or rafters, measure the exact location, then cut the speaker hole and retrieve the wire after the sheet-rock is installed.