Use pre-construction brackets when installing ceiling speakers. The snap-away wings make it easy to mount your speaker first to the bracket itself; then between the studs. Made from ABS; this bracket works perfectly with joists spanning 12.5" to 29.0". This bracket is designed to fit most round 6.5" installed speakers. Use the speaker clamps built into the ceiling speakers to attach the bracket; it's just that easy. This affordable time saver is a must have when installing speakers into new construction; whether it be an entirely new house; business; or your home theater project. Each bracket is sold individually. Features: Use the adjustable arms to attach the bracket to studs or joists before the drywall goes up The arms are adjustable to allow for unusual stud or joist locations It can be attached using nails; dry-wall screws; or construction staples (not included) Solid ABS pre-construction bracket Fits between joists 12.5" ~ 29.0" apart Snap-away wings make installation simple