stringer
  Closed stringer with an extension for
  winder treads.
We make custom solid hardwood stringers, which can be any thickness, any size, and any shape.
From the standard 22mm closed and open for standard treads, to 3 inch thick curved free standing stringers.

The example shown is painted stringer for a staircase with winders, which also changes from closed to open near the start.
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