AtlasIED BMT95-4-7 Blind Mount 4 inch Enclosure 7 inch DeepAtlasIED 4" Blind Mount enclosure system ( U. S. Patent # 4,673,149 ) provides an easy and cost effective alternative for secure speaker installation in retrofit ceiling applications. All necessary hardware is provided including a unique support system with mounting ears that telescope out from inside the enclosure and adjust vertically to accommodate ceilings with a thickness of 1 2" (13mm) to 1 3 8" (35mm). Units feature CRS construction and include