When it has to be robust
Steel frames are certainly a good solution, especially for door solutions in new buildings or renovations with high stress on the respective parts of the building.
We basically distinguish between the masonry frame for mortaring, the steel frame for lightweight walls for installation by drywallers and the plug-in frame for subsequent installation in existing masonry.
Due to the great variety of possibilities and design variants, we also recommend consulting our door professionals to select the correct product.