Aerosol -Penetrant - 400ml - Sparex Part S.27687WD 40 Penetrant Industrial Grade (400ml Aerosol) is your go to solution for freeing corroded nuts and bolts. This powerful penetrant instantly penetrates rust, providing rapid access to tight areas to release stuck parts and corroded components. Not only does it effectively lubricate, but it also offers protection against rust and corrosion, ensuring your tools and machinery remain in optimal condition. Product Specifications Alternative to 159974