RV-FS41SPW Sound-Panel 41mm Mounting Spacer - White The Sound-Panel has three accessory mounting spacers available to create a professional indoor or outdoor install, where cavity depth prevents standard speaker installation. Simply select the spacer size that suits your installation mounting depth and start your install. Use the 41mm (1-5/8”) spacer to create a clean indoor or outdoor installation of the RV-FS402W / RV-FS402B Sound–Panel. Install directly onto any flat surface with no cut out required. Warning [https://productimageserver.com/prop65/6pt.png]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 [http://P65Warnings.ca.gov].