Track is not pre-drilled to allow you to drill holes at the necessary places. 4- hangers with 3" cast steel wheels (hanger length is 13 1/2 " x 2 " wide x 3/16" thick).
1- hex lag screw for each 1 ft of track selected. 1- spacer / stand off for each 1 ft of track selected. 1- connector piece for tracks longer than 7 ft.
Minimum clearance required above door for the installation of this hardware is 6 1/2. Max weight capacity for each set of wheels (one door) is 350 lbs, the track will hold up to 500 lbs if installed correctly into studs. This item is made of steel and made in usa, hardware.