The Bose Professional Adjustable Tile Bridge for FreeSpace DS 40F and DS 100F Loudspeakers is a pair of tile bridge kits that allow you to mount your Bose FreeSpace DS 40F or DS 100F loudspeakers in hard-deck or hung tile ceilings, ideal for commercial and retail applications. The Adjustable Tile Bridge enables off-center positioning in ceiling tiles and accommodates installations requiring a tile bridge that can fit through a ceiling hole. Installation screws are included.