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A double stringer staircase consists of two stringers, which are the horizontal beams that support the treads and risers. The stringers are typically made of steel, wood, or a combination of both. The treads and risers are attached to the stringers using screws, nails, or welds. The double stringer design provides added stability and support to the staircase, making it suitable for high-traffic areas. double stringer staircase detail dwg free