Model 81-8R handles 8" loudspeakers and features a round cut-out that suits baffles mounting the industry standard Atlas Sound 95 Series enclosures. Constructed of 24-gauge CRS with an electrogalvanized rust-resistant finish. Load-Bearing Bridges Eliminate Ceiling Tile Sag by Distributing Assembly Weight to Ceiling's Support System Round cut-out that suits baffles mounting the industry standard Atlas Sound 95 Series enclosures.