The aluminum hook RH HB AL is suitable for the installation of photovoltaic systems on pitched roofs with roof tiles of varying thicknesses. 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 roof hook to be adjusted to different tile thicknesses. The upper adjustment position allows for the adjustment of the distance of the rail 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.