1x adjustable roof hook is suitable for the installation of substructures on roofs covered with roof coverings such as Tondach, Bramac, Creaton and similar. Roof hook is screwed into a wooden rafter. This roof hook has single adjustability intended for levelling out the uneven parts on the roof for the aesthetic purposes of aligning solar panels. An adjustment range of 25 mm enables levelling the position of the profiles. In a set together with fastening bolts.