Industrial-strength penetrant in a portable 3 oz aerosol spray. Engineered for field technicians and mechanics, Aerokroil delivers deep-creeping action that penetrates microscopic openings to break rust bonds, dissolve carbon deposits, displace moisture, and free seized bolts and assemblies. Safe on all ferrous and non-ferrous metals. 50-State VOC compliant. Made in the USA. Keep one in your toolbox for fast, on-site maintenance and repairs.