KROIL Penetrant 1 Gal. can is an industrial-strength penetrating oil formulated to quickly penetrate deep into small crevices. KROIL attacks rust and corrosion to help loosen frozen or seized metal fasteners such as nuts, bolts, screws, studs, hinges, tools, pulleys, chains or valves. Safe on all metals, it is ideal for stuck parts on cars, trucks, ATVs, fleet, farm and agriculture engines and equipment. KROIL cleans, displaces water and helps prevents rust. Its easy application makes even the toughest maintenance jobs easier, faster, and simpler. KROIL has been used and trusted by industrial and trades professionals and DIYers since 1939. KROIL is an industry-leading producer of penetrating oils, lubricants and chemical specialty products. When stuck on a job or project, use KROIL.