RV-FS22SPW Sound-Panel 22mm Mounting Spacer – WhiteThe Sound-Panel has three accessory mounting spacers available to create a professional indoor or outdoor install, where cavity depth prevents standard speaker installation.Installation:Simply select the spacer size that suits your installation mounting depth and start your installUse the 22mm (7/8) spacer to create a clean indoor or outdoor installation of the RV-FS402W / RV-FS402B SoundPanel when the minimum wall or ceiling cavity is 19mm (3/4)WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov. Specifications:Type: Mounting BracketsBox Dimensions: 1″H x 9″W x 19″L WT: 1 lbsUPC: 753759175122