A connecting link for a chain Grade 100 is a component used to join two lengths of Grade 100 alloy steel chain or to connect the chain to other rigging hardware, such as hooks, master links or slings. Connecting links for Grade 100 chain are designed to meet specific safety and performance standards, ensuring they can handle the heavy-duty requirements of various industries, including construction, manufacturing, and material handling. These links are typically shaped like a small, sturdy metal link with openings at each end to attach the chain and other rigging hardware securely.