A main runner is the primary T-shaped metal support beam in a suspended ceiling grid that carries the weight of cross tees and ceiling tiles. A long, T-shaped metal strip (typically 3.6 meters or 12 feet long) made of durable galvanized steel. Suspended from the structural ceiling using hanger wires attached at regular intervals. It acts as the backbone of a drop ceiling, bearing the main vertical load of the framework. Interlocks with cross tees to form uniform modular squares or rectangles (such as 600mm x 600mm) designed to hold acoustical tiles or panels. Provides stable structural alignment for integrating lighting units, air vents, and smoke detectors into the ceiling layout. Hides unsightly wiring, pipes, and structural flaws while maintaining easy access to the plenum space above.