Indoor stairs


The Jap Shell combined spiral staircase is for interior use. The stair step is made of solid beech, optional oak, maple or ash. At first glance, this type of staircase is impressive for its elegant way of turning the central column and carved steps into the shape of a half moon.

Technical information

Possible width of stairsdiameter 160-240 cm

Material composition of stairs

  • metal structure
  • stainless-steel structure
  • rung surfaces of hardwoods, such as beech, oak, maple, ash
  • rung surfaces of metal (stainless steel) and glass
  • rest of stairs: metal, wood, glass stainless steel

Wood surface treatment

  • varnishing – varnish shade per RAL swatch book – three-layer clear polyurethane varnish provides greater durability of wood components
  • oiling – protects the natural wood material from unwanted yellowing, re-oil after wear
  • brushing – makes the prominent wood grain stand out, done by mechanically removing the soft part of the annual ring
  • staining – treatment of wood colour shade; we also stain according to samples provided by the customer


  • railing type E, F
  • stainless-steel railing

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