Spiral Knock Plus stair construction: This stair construction combines advanced technology, practicality and sturdiness in such a way as to personalize the product, both in terms of configurations and dimensions. A stair construction solution that adapts to any dimensional situation where steel and wood elements are perfectly combined together finding their mutual enhancement in Knock Plus stair construction— the harmony of thousands of solutions. Consisting of metal support elements, this stair construction is fitted together using a telescopic system for rise adjustment. Stair construction supports are of 3 sizes, depending on the determined tread. The bottom support comprises a fixture for floor fitting which permits adjustment of the first rise. The stair construction structures of the cross-shaped landings is suitable for fitting to walls and can be bottom, intermediate and top. The side supports are of the telescopic type for adjusting the distance between the stair and the adjacent wall. The cylindrical shaped floor supports comprise a spacer for height adjustment.
Steps are made of solid dried beech wood in this stair construction. The railing consists of metal balusters. The first balusters on the steps connect these together making the entire stair assembly very stiff. The handrail is cylindrical in solid wood. The "cobra" handrail in plastic material fits in case of curvilinear railings. This stair construction has been specially designed to suit the various stair slopes. Finished wood parts of the stair are varnished and then polished with a double polyurethane varnish coat. The metal parts of the stair are painted with epoxy powders.

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