Window construction is a project with special requirements. Not only for DIY enthusiasts and professionals themselves, but also for their screws. After all, windows are made of a wide range of different materials, and some make installing window fittings nothing short of a Herculean feat. Like thin profiles made of plastic and metal, for instance, or material combinations like plastic profiles with internal steel reinforcement. So how can such projects still succeed? With SPAX, of course.