Round-based iron spiral stair with steel structure.
High-gloss glazed steel structure ,  RAL 9005 finish, black.
Spindle with polished stainless steel double plate, high-gloss lacquered steel external strip, RAL 9005 finish, black.
Layered glass tread available in lacquered black  with steel outer frame.
Helix central pole with no visible screws.
Layered glass tread available in lacquered black with steel outer frame.
External strip  with no visible screws.
ALCANTARA banister- design by Perusko-Sartori central strip with an Alcantara coating , SAND GREY finish, polished stainless steel handrail, spindles with stainless steel double plate.