The shackles are made of 304 stainless steel, resistant to all weather conditions and especially to chlorides, acids and salt water. Shackles are used in lifting operations and static systems as removable links to connect steel cables, chains and other accessories. Threaded-bolt shackles are mainly used for non-permanent applications. Simple to use, Make sure the pin is screwed into the shackle hole correctly, tighten it by hand, and then fix it with a wrench or other suitable tool. D-shaped shackle consists of D-ring and bolts. The shackle is well made, perfectly fit and without burrs. It can withstand all weather conditions and is not easily damaged. This 304 stainless steel D-ring shackle lock is widely used for hanging sandbags, home, mountaineering, hiking, anchor chains, sailing accessories, carabineer, flower basket hook connection screws, carabineer, heavy screw chains, hooks and other attachment connections.