With a diameter 120 cm or 140 cm, this spiral staircase in solid beech stained and varnished is adjustable in height of tread thanks to a system of rings of 5 mm thickness. It’s so adjustable from 20,5 cm to 22,5 cm. Made up with 13 treads + 1 landing, its maximal height is 315 cm (level landing). The banister is made up with balusters in grey lacquered metal and a handrail in solid stained varnished beech. For a round or square cavity (adjustable landing). Option : landing balustrade.