The ProX XT-USHACKLE screw pin anchor U shackle is made of galvanized steel. The anchor shackle is a tough and durable accessory for trussing and stage roofing systems and nylon slings, as well as polyester slings. Paired with a lifting sling, they help protect the eyes of your sling from wear and tear on clevis hooks. Also excellent for use in hanging video walls.