Definitive Technology RBAE Pre-Construction Bracket for DI 8R Speakers (Pair)When planning speaker installations in new construction many installers find it useful to install rough-in brackets onto wall studs or ceiling joists so that the sheetrock contractor knows precisely where to cut the appropriate size holes. The DI Series rough-in brackets were custom designed from the ground up to be the toughest, easiest to use and most useful brackets in the industry. The arms are metal mesh and can easily be attached to wood or metal construction m