These large, heavy-duty shackles are specifically for use with grommet slings. They have large interior dimensions, especially at the bearing point which yields greater surface area contact for the grommet sling. This increases the sling capacity by a minimum of 60% and also extends the sling's lifespan. These shackles are made of cast alloy steel, Quenched and Tempered. Bow and pin utilize RFID technology. Rated in metric tons and proof-tested prior to shipment. Safety factor of 5:1.