Metal staircase

This type of staircase is commonly used in public facilities as the main or emergency escape staircase; it can also be used in private houses as indoor or outdoor staircase. The most common model includes treads in the shape of an open box, which can be filled with concrete, parquet, linoleum, carpet, wood or any other material. Outdoor staircases are galvanized or made of stainless steel.

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