Used to support the 6x4 and 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 7/16in nut driver on slide clamps. Also can be secured directly to the top of cabinets, For 1/2in threaded rod. FR6CS12 BRACKET 1/2" THR ROD CENTER SUPPORT