Helix iron stair with open riser.
Double load-bearing structure outside steps, made of steel.
Structure painted with micaceous iron glaze, 609.0400 finish, light grey.
Cut beech solid wood tread, finish from sample.
Tread fixed to the structures with soldered steel wings and recessed teeth with no visible screws.
AIR6C banister: 5 satin-finish stainless steel rails, steel handrail, spindles with steel double plate.