Pylex 13903 Riser 3 Steps Steel Stair Stringers, Black Durable baked powder coating finish Pre-drilled holes for stairs attachment Treads of 10-1/4-inch - risers of 7-1/2-inch Sold as a single unit, 2 units or more are necessary to build a Stair Consult your local building code to make sure this product complies to it