Grade 70 Chain Was Designed Specifically To Provide A 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 Speci Fications Of The Department Of Transportation & Ccmta For Tie Down Use. All Clevis Hooks Are Made Of Heat Treated Alloy Steel. 10 Assemblies Per Orange Barrel