Welcome to MHB, Dutch masters of steel since 1667. As a 350-year-old Dutch family business, we have a rich history of innovation, craftsmanship, and quality. We are the exclusive developer and manufacturer of all our thermally broken solid steel profile systems for both interior and exterior projects, allowing us to tailor our solutions to each project. We create the most beautifully designed, high-performing, and durable steel windows and doors in the world.