New Life For Dried-Out Joints - Whether unserviced or just sitting, grease in steering and suspension joints harden over time, making it impossible to lube the joint. The rejuvenator lets you save the joint by injecting a light-weight oil through the fitting to break up hardened grease and blow through any dirt that may be trapped, allowing the joint to be properly greased. Quality 1144 steel construction with extension in a wooden display case. Lifetime warranty. Made in the USA.