Grade 30 proof coil chain, sometimes referred to as common coil chain, is an economical general utility, low carbon steel chain ideal for light-duty applications involving pulling or restraining. Proof coil chain is perfect for everyday use in ordinary applications where high-strength characteristics are not required. Grade 30 chain is commonly used for various industrial and agricultural uses, including towing, logging, lashing cargo, and guard rails. Proof coil chain is not intended for overhead lifting.