Unlimited 8000 Series Fixed and Specialty Windows are a designer's dream. Take a slider and add radial arches. Take a single hung and add a quarter round to each side above a picture window. Trapezoids, arches, triangles, quarter rounds and half rounds - there is an Unlimited Inc. configuration to equal even the largest imagination. The Unlimited 8000 Series Fixed and Specialty Windows are designed to have a fully compatible sight-line with our vinyl products. Combining a picture window with end vent casements or double hungs has never been easier. A more dramatic look can be achieved by the addition of Unlimited geometric units to create a truly magnificent focal point.