Two unique Makita features contribute to the super-safe low vibration benefits of this advanced machine the patented Makita AVT Anti Vibration Technology system uses the pneumatic pressure generated in the hammer piston chamber to move a counter balance in the opposite direction to dampen out the impact vibrations at the steel point. This dramatically reduces machine produced vibrations & in addition to the advanced AVT system this new Makita 5kg hammer features the 2-Mass fulcrum hinged rear grip handle & the vibration damping side handle to further limit HAV risks.