HANDCRAFTED QUALITY MADE IN LUXEMBOURG For over 50 years, our family-owned firm has been making extensively handcrafted produ ... cts to meet customers' specifications and backing them up with superb service. At first we only made windows and front doors. But we have meanwhile extended our portfolio to include mullion-transom façades, raffstore blinds and roller shutters, swing and sliding shutters and insect screens. For us the good quality, form and function of our products is as important as good service. For us, a good service starts already with the individual consulation - beginning wiht the planning phase. Our object: to satisfy the requirements of the architects and clients such as the idea and implementation will become an accurately-fitting harmonically unity. Of course, many criteria have to be met: we just carefully select the best possible quality of our materials and components, implement energy-related requirements, consider accoustic insulation and also anti-burglary protection. After the fitting of our qualified Teams, our mission aren't yet fulfilling. In addition to our reliable and qualified client service, we offer to our clients the exclusive OST maintenance service. We recommend that you have to fittings, air- and water tightness and surfaces of your windows and doors professionally checked and maintained from time to time. We guarantee additional the logevity of form and function of your OST windows and doors. read more