VEVOR, your exclusive tool expert. This binder chain is made of high-quality steel and has passed Grade 80 DOT certification. It also has alloy steel grab hooks to better grip large cargo. The diameter of the chain is 5/16 inch, and the length is 20ft can firmly fix heavy items. It's the ideal option for transport. | Vevor | | Transport Binder Chain, 4900lbs Working Load Limit, 5/16''x20' G80 Tow Chain Tie Down with Grab Hooks, DOT Certified | Gold | Best Buy