wrecker roll back tow axle strap T-J hook tow truck recovery tj hook t j chain hook 1.Heat Treated: drop forged ,tempered and quenched. 2.Material: stainless steel,carbon steel. 3.Standard: European type,JIS type,US. type ,DIN type.. 4.Size: various or according to customer design 5.Surface:hot dipped galvanized, electro galvanized ,self-color,color painted.