The LockNLube GB18 Pneumatic Hammer Grease Buster replaces the standard piston in your Shop Size Grease Buster. The pneumatic hammer grease buster is compatible with pneumatic hammers and uses the percussion and vibration of the hammer to effectively work the penetrating oil into a clogged fitting. Incorporating penetrating oil from the grease buster into the clogged fitting makes this the perfect easy-to-use product.