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Risers: 7½" high
Treads: 11" long
Predrilled: for 2 x 12 or two 2 x 6 planks
Stringers: 1½" x 1½" x 3/16" angle iron
Tread Supports: 1½" x 3/16" flat iron
Paint: Black Primer Coat

Drawing is pair of 3S1-M steel stair stringers.


Top Bar: ¼" x 1½" Flat Iron
Bottom Bar: ¼" x 1" Flat Iron
Posts: ¾" x ¾" x .065 Tubing
Intermediate Bars: ½" x ½" Square Bars
Feet: ¼" x 1½" x 4½" Flat Iron
Front Foot: Adjustable Cast Shoe
Paint: Black Primer Coat

Photo has a 4R12-36 railing installed on a pair of 3S1-M stringers.
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