ONE 4 LITRE BOTTLE OF CRC 5.56 MULTI PURPOSE LUBRICANTTHE PROFESSIONAL S CHOICE!The great penetrating power of CRC 5.56 gets through rust, corrosion, scale and dirt and breaks the tension that bonds corroded parts. CRC 5.56 drives out moisture and prevents future freezing . CRC 5.56 also lubricates and cleans. Use on nuts, bolts, hinges, battery terminals, sporting equipment. An application of CRC 5.56 is recommended before parts are reassembled to prevent future corrosion.