Mono block spiral staircase entirely realized in steel. The treads are welded to the steel central pole in groups of three or four. The stair railing is realized with steel tubolars. Because of the treads' mono blocks this staircase has a considerable weight and encumbrance, and it is necessary to take it in consideration for the transport, the fitting and the house accesses.
Spiral monoblock staircases have the particularity of being made entirely in steel. Steps are solded to the central pole, and in this way the stair seems to be realized in one piece like a monolith. This kind of stair are unically bespoke made.