LIQUID WRENCH Pro Penetrant & Lubricant Powered by Flash Sight Technology is designed for performance and efficiency, this is a fast-acting, anti-seize formula that penetrates corrosion, loosens rusted bolts and parts, stops squeaks and displaces moisture. The Flash Sight technology's built-in LED lets you see where you spray. Choose between the light only or light and spray. Switch to the locked off position to prevent unintentional spraying.