OS2 40 is the iron window in precious metals, with tubular profiles of 12 mm, central node between the two sashes of only 62 mm, depth of 42 mm for glass up to 15 mm.Designed for interior design, the light but robust tubular profiles of 0S2 40 reproduce the same image as the other profiles of the OS2 series, creating an effect of continuity between the interiors and the exteriors of the building.