On the market since 2010, the designer spiral staircase from the Italian company RIZZI is an exquisite addition to any property. The outer diameter is available in sizes from 125 – 300 cm. Spiral staircase is made out of prefabricated concrete blocks that are bonded together. It is unique in a way that it does not need a support structure in the middle of the staircase and can be built to any height. Once the staircase is built, finishes like Betonepox, Betonepox Soft or Betonepox Ultrasoft can be applied over the surface, giving the ultimate luxurious feel.