High-strength alloy steel is used to create the shackle, which has a "D"-shaped design with a threaded pin that is readily tightened or loosened by hand. The large dee shackles is intended to join chains, cables, or wire ropes and is frequently used in lifting, towing, and rigging operations. https://www.zhongheindustry.com/products/european-dee-type-commercial-shackle.htmlAll Rights Reserved