5/16 Inch 3/4 Ton Screw Pin Galvanized Drop Forged Carbon Steel Anchor ShackleMetal shackles are the standard choice for connecting slings, ropes, chains, and other equipment to loads or each other in lifting, pulling, or rigging operations. Each shackle has a body and a pin. D style shackles, also known as chain shackles, are used to move large loads in a straight line because side and racking loads can distort them. Anchor shackles are used in applications where shackles will be frequently connected and removed.