The indoor custom metal furniture product line includes steel staircases, spiral staircase, steel railings, steel balusters and steel banisters. Lamberti Design presents a work for an attic of a private residence in Avellino, in the province of Salerno. The spiral staircase that was installed in this private residence becomes almost sculptural in its effect. A sinuous structure in fire-painted metal with white RAL epoxy powders stands out in front of a high window. The staircase stair stringer is made from a flat iron plate 1 cm thick calendered to measure. The vertical uprights in paired plates connect to a round tube in stainless steel with a satin finish. Hand-curved running rods are placed between the painted iron uprights. The tread structure is in iron with tempered opal crystal panels. The self-supporting staircase is fixed in two points. After inspecting the job site, all the steel furnishing elements were engineered, produced and carefully packed, and then transported to the job site and installed.