JBL Professional CSS-TR4/8 Tile Rails for CSS-BB4x6 and CSS-BB8x6 Backcans, 12-Pack

12-piece tile rail mounting system designed for suspended ceiling installations. Supports six backcan speakers per rail, compatible with standard ceiling speaker models CSS-BB4x6 and CSS-BB8x6. Includes M4 x 8mm machine screws for secure fastening. Ideal for professional audio installations requiring flexible, adjustable speaker positioning in drop-ceiling environments.