Usage: Installation of a photovoltaic module in a horizontal configuration on a flat roof. Valkbox 3 mounting system from the Dutch company Van der Solar System. It contains 2 anodized aluminium brackets with an adjustment angle of 20 degrees and 4 special rubber stands for load plates. The Valkbox 3 kit is designed to mount each PV module individually, there are no connections to other brackets when mounting multiple modules. PV modules are mounted on special hinges that allow the modul