Iron stair with closed riser.
Double load-bearing running structure outside steps made of steel.
Structure painted with micaceous iron glaze,  609.0401 finish, medium grey.
Iroko solid wood tread and riser with walnut finish, structure with  lower cladding.
Lined tread and riser, with no overlap.
Tread and riser fixed with no visible screws.
AIR6C banister: 5 satin-finish stainless steel rails, steel handrail, spindles with steel double plate.