The Wyr-Grid® 18" (457.2 mm) FiberRunner® QuikLock™ Trapeze Bracket is made of steel and is black powder coated. It is 12.2" (309.9 mm) high, 18.7" (475.0 mm) long, 2.3" (58.4 mm) wide, and 18.7" (475.0 mm) deep. It attaches to the Wyr-Grid® 18" (457.2 mm) wide pathway to support a secondary FiberRunner® 4 x 4 or 6 x 4 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.