An ideal solution for square limited openings that are covered on two or three sides by walls. By placing a metal or wooden axis in the center of the opening and extending the steps from the axis to the surrounding walls, we make use of the space and have more convenient access to the upper floor. There is no requirement for installing railings at the points where we have walls. However, there is the possibility of installing a handrail on the wall using special fittings, depending on the model we choose.