This garage door hardware box is for 8x7 or 9x7 doors,which is for one car. The door height is 7 feet high. The complete overhead garage door hardware kit includes all hardwares for building your door, which contains hinges, Top brackets, Bottom Brackets, Bearing supports, Flag Joint Angle, rollers, cables, Screws etc. This kit uses the door hinge of 14gauge,#1,#2?#3 hinges, and if you need side hinge or center hinge to instead of them, it is also workable. Your door will run better with this kit and will provide you with years of continual service. This standard kit will really improve the doors performance.