3/8-Inch X 20-Foot Chain With Grab Hooks. Grade 70 chain was designed specifically to provide a light, yet strong chain for tie downs. Made from carbon steel and zinc plated gold chromate for corrosion resistance. Heat treated and 100% proof tested to 2X WLL rating. Made to NACM standards per specifications of the Department of Transportation & CCMTA for tie down use. All clevis hooks are made of heat treated alloy steel.