GCS global ceiling speaker designed to give exceptional frequency response in economical, fully assembled, easy to install package. Beam clamp ready with beam clamp kit option. Easy installation for beam flanges 1/8 to 5/8". Center mounted 1/4"-20 fastener for easy all-thread rod hanging. White baffle and grille for great installed appearance. 5.25" coaxial speaker is mounted in steel enclosure and comes with attached junction box. Ideally suited for commercial drop-tile ceiling applications. GCS comes complete with mounting rails and grille, pair-packed and ready to install. With its 70/100V extended-bandwidth transformer and variable-tap selector switch, accessible after installation, GCS significantly reduces installation time.