Fasten with screws to the upper end of the door leaf of the bar, which are included in the package of accessories for the door-cap. They are used to install the upper rollers on the door. Using a special nut located on the mounting planes, install the door in the horizontal direction. To exclude the possibility of involuntary opening of the door, fix the beam on the wall horizontally. Fix the lower video with self -tapping screws. Now you can install the door leaf on the rollers and attach the movement limiters supplied in the kit.