Usually a 2 x 4 or 1 x 4 that attaches to one side of the
stair stringer to allow a gap between the wall and the stringer to allow
easy drywall installation around the stair stringer's.
Even though the drywall spacers have been attached to
the stair stringers, the stair treads and risers still need to be cut
correctly, otherwise you will defeat the purpose for creating this gap.
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