The Wyr-Grid 12" (304.8 mm FiberRunner QuikLock® Trapeze Bracket is made of steel and is black powder coated. It is 12.2" (309.9 mm high, 12.7" (321.6 mm long, 2.3" (58.4 mm , and 12.7" (321.6 mm deep. It attaches to the Wyr-Grid 12" (304.8mm wide pathway to support-secondary FiberRunner-x-or-x-channel above the Wyr-Grid pathway. It adjusts 6.6" (166.6 mm to 9.9" (251.0 mm over the top surface of the Wyr-Grid pathway. It comes in standard packages of one.