This Galvanized Steel S-Hook is designed to form a solid connection between a swing set and the chain that holds it firmly in place. Safety is paramount when it comes to children's playground equipment and the materials used in construction need to be able to endure kids swinging, pulling and putting pressure on it day after day. That's why even the smallest pieces of equipment we supply like the Galvanized Steel S-Hook are tested to the extreme and meet multiple national standards and guidelines.