Rough-in mounting plate for new construction for use with the EVID C4.2 (4 pcs) RR series mounting plates aid in the installation of the EVID ceiling speakers in sheetrock or plaster ceiling installations. For most installations, no additional hardware is needed. EV recommends installation of the optional RR series rough-in accesssories before the ceiling material is installed. The rough-in accessories provide a cutout guide when many holes are to be made in a production-line style installation and to ensure the speakers are positioned correctly as the holes are cut in the sheetrock.