Precision engineered with G-Force technology for the ultimate in safety and performance, Working tube made of SteelPro™ alloy steel to provide superior strength, toughness and impact resistance while maintaining unmatched ductility, Surface-treated provides abrasive and contaminant protection while preventing rust, Piston rods made of S45C medium carbon steel for precision and wear resistance. Hard chrome plating process ensure extended durability of the rod, Reinforced piston provides optimal tube pressure control and resistance for increase ride quality, OE fluid contains special additives to perform among extreme temperatures and helps reduce oil breakdown, Professional grade fluid seal reduces excessive friction and increase longevity by preventing premature leaks, Nitrogen gas charge maintains road contact for enhanced ride and handling by reducing aeration and shock fade, Premium hardened mount following OE spec for easy installation. SAE-Grade bolt and nuts, Part Reference Numbers : 347457 347459 3440111 550067 ASH25774 ASH25775 HC3Z18124A HC3Z18124B HC3Z18124C HC3Z18124D HC3Z18124E HC3Z18124F HC3Z18124G HC3Z18124H HC3Z18124K HC3Z18124L HC3Z18124M HC3Z18124N HC3Z18124P HC3Z18124R HC3Z18124S HC3Z18124T HC