Grade 70/System 7 5/16" x 20' Long with Grade 70 Clevis Grab hook on both ends. System 7 Grade 70 chain was designed for cargo securement, binding, towing and construction use. Also called Transport Chain, it averages a 20% higher load rating than High Test chain (S-4, Grade 43). Induction heat treated, the chain meets all requirements set forth by the DOT / CVSA / CHP for truck tie-down use. Yellow zinc finish is standard on chain. These chains have a Working Load Limit of 4,700 lbs with a design factor of 4:1. Minimum breaking strength is 18,800 lbs. WARNING: Do not exceed WLL (working load limit) for any chain, tiedown or cargo control device. Not approved for overhead lifting.