Premium Material: This steel stair stringer is constructed from high-quality steel with a corrosion-resistant powder-coated black finish, ensuring durability and resistance to harsh outdoor conditions. Perfect for long-lasting use. Complete Installation Kit: Each package includes three 4-step stair stringers, set screws for concrete walls, and screws for attaching wooden treads. (Note: Wooden treads are NOT included.) Easy to Install: Designed for hassle-free setup, the deck stringer comes with pre-drilled holes. For proper installation, keep the spacing between two stringers no greater than 3 feet, and ensure the first tread is positioned 9 inches below the deck surface. Heavy-Duty Load Capacity: Engineered to support up to 500 lbs, these metal stair risers provide reliable strength and stability for a wide range of outdoor stair projects. Versatile Outdoor Use: This outdoor stair stringer is ideal for creating stairs on decks, patios, and garden pathways. Its sturdy and functional design is perfect for both DIY enthusiasts and professional builders. Stair Riser,stair stringer,no treads