Product descriptions from the supplier [EXTREME HEAVY DUTY] Grade 70 transport chain, heat treated for truck tie-down. Equipped with a Grade 70 clevis grab hook on each end for fast, secure attachment to trailer tie-down points. [QUALITY COMPONENTS] Made from correctly alloyed raw materials, each batch tested for hardness and tensile strength. Professional-grade heat treatment ensures all hardware meets required strength ratings. A protective coating gives a smooth finish and