Steel Zink is the outdoor spiral staircase made of steel protected with a zinc coating. The handrail is in grey PVC to match the staircase finishes. The nuts and bolts are in stainless steel. The railing consists of steel balusters protected with a zinc coating. The staircase is characterised by a landing that allows installation in openings without hole or with square hole. The direction of rotation, clockwise or anticlockwise, is decided at the time of installation. The diameters are 120, 140 and 160cm.