DETAILS: Da-Lite"s Mounting Brackets are used for convenient mounting to extend screen from wall to avoid obstacles such as chalkboards. Model No. 11 mounting brackets adjust for 14.5" - 24". Product Description Da-Lite Mounting Brackets Model No.23 - wall mount bracket Packaged Quantity: 2 (specifications are for single item) Product Type: Wall mount bracket ALTERNATE ITEM #: 40933 UPC: 0717068255722