The FiberRunner® Center Support Bracket is used to support the 6x4 or 4x4 systems from below with new threaded rod. Bracket is secured to threaded rod with two nuts. The pre-assembled slide clamps enable fast assembly to channel. Use 7/16-inch nut driver on slide clamps. Also can be secured directly to the top of cabinets for 5/8-inch or 16mm threaded rod.