FerroFinestra W40 authentically keeps the style that left an everlasting mark on architecture from the early 20th Century onwards, with its clean, elegant design. Together with the Stucco and W20 profiles, FerroFinestra W40 is the only one on the market to use the original hot-rolling production technique, introduced at the end of the 19th Century. Ottostumm | Mogs FerroFinestra W40 comes in a complete range of thick steel profiles, guaranteeing utmost strength. The system makes it possible to create very large windows with minimalistic frames, in all types of opening: side-hung, bottom-hung and top hung, tilt and turn, pivoting, sliding and folding.