When it comes to freeing corroded items in tough spaces, nothing rivals powerful, industry-proven Kroil penetrating oil. Used and trusted by pros and experienced DIYers alike since 1939, Kroil quickly loosens rusted nuts and bolts, frees frozen shafts, pulleys, and more. No space is too tight to reach, thanks to Kroil's ability to penetrate the smallest opening, thread or crevice. Corrosion meets its match, as Kroil helps remove and prevent rust, cleans and lubricates, and displaces moisture. FeaturesAttacks corrosion - frees bolts, fasteners and other mechanical componentsHelps remove rust and carbon deposits - will not attack or damage metalPenetrates quickly - penetrates quickly and deeplyWorks everywhere - use on any corroded threads or tight partsSimplifies repairs - makes the toughest maintenance jobs easier, faster and safer to executePenetrates deeply - penetrates the smallest spaces, threads and openings