WD-40 Specialist Penetrant is a fast-acting penetrant with capillary action to penetrate deep into crevices， threads and seams to break the rust bonds that hold stuck parts together. It is a low odor formula that works on contact to free rusted nuts， bolts， threads， locks， and chains leaving behind a protective layer that prevents rust and corrosion from re-forming. It can also Spray 2 Ways_®- up for stream and down for a wider spray.