Loosen frozen metal parts with Kroil Penetrant. When it comes to freeing corroded items in tough spaces, nothing rivals powerful, industry-proven Kroil penetrating oil. Used and trusted by professionals 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 into spaces as small as 1 millionth of an inch. Corrosion meets its match, as Kroil dissolves and prevents rust, cleans and lubricates, and displaces moisture. This product can expose you to chemicals including beta-myrcene, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov