1/2'' Binder Chain Transport Chain Grade 701 2 in. Binder Chain Transport Chain Grade 70 5 ft. Clevis Grab Hooks Our 1 2 in. binder chain grade is made of carbon steel, grade 70 chains are used for truck tie down, cargo securement, towing and any jobs which don't require overhead lifting. The elongation for grade 70 chain is at least 15%, this is to ensure the chain won't break abruptly under normal load, elongation is no less than 20% for our grade 80 chains and grade 100 chains. All our