Build a seven-step outdoor stair route with this three-pack of steel stair stringers for a 57-inch deck height. The stringers are made from heavy-duty galvanized steel with high density, load-bearing capacity, wear resistance, and durability for long-term outdoor use. Each flat section has four bolt holes for connecting wooden boards, allowing one to four boards to be placed. Installation follows four steps: position the stringer, drill with a 3/8-inch bit, secure it with expansion bolts, and install the wooden boards. Expansion bolts and wood nails are included. The stringers can be installed on wooden, brick, concrete, or iron walls.
Galvanized steel stringers: Heavy-duty galvanized steel provides the stringers with high density, load-bearing capacity, wear resistance, and durability for long-term outdoor use
Seven-step configuration: This three-pack is made for stair layouts with seven steps and a stated deck height of 57 inches, keeping the primary stair-riser format clear
Four-hole flat sections: Each flat part has four bolt holes for connecting wooden boards, with space to choose one to four boards for the stair surface
Included fastening pieces: Expansion bolts and wooden nails are included for the installation process, helping secure the stringers and connect the wooden boards
Four-step setup: Installation uses positioning, drilling with a 3/8-inch drill bit, securing with expansion bolts, and installing the wooden boards
Flexible wall placement: The stair stringers can be installed on wooden walls, brick walls, concrete walls, or iron, matching the listed installation surfaces