
But the real innovation is represented by the step, which includes in the diameter the attachment supports and the upper lining which is also possible to change. As for the spiral staircase and all the staircases of Interbau for example the stairs in stainless steel , also this Aluminium Staircase is made with less screw in view as possible. Here the 6 screws of each step have been put into special slots, which have been emptied thanks to a CNC machine. The upper “cover” is made out of plate iron covered with wood and is supported with special magnets. Also this supporter has been worked out by the partial empting of the step.