The Black Diamond Grease Fitting Unblocker is built to open clogged grease fittings and loosen hardened grease joints by forcing light-viscosity oil through the coupler and into the joint to break up dirt and debris. Its all-steel construction is designed to be tapped with a hammer, and a built-in hand guard adds safety during use. A flexible hose attachment helps reach fittings in difficult areas, and the kit includes a grease coupler plus two spare seals to replace piston seals as they wear. Ideal for maintaining and protecting bearings, control arms, joints, king pins, and other greased components.