The aluminum hook RH AL is suitable for the installation of photovoltaic systems on pitched roofs with tiles of varying thickness. The horizontal adjustment on the base plate allows the roof hook to be precisely adapted to the roof tiles. The lower adjustment position enables the adaptation of the roof hook to different tile thicknesses. The upper adjustment position allows for the adjustment of the rail's distance from the top of the roof tile. The shape of the hook is designed to withstand the legally required snow and wind loads without damaging the tile.