-High performance rotary hammer drill with 4 functions: drilling, hammer drilling, chiseling, and releasing -Large capacity cylinder for stronger 3J impact energy and more efficiency -360° auxiliary Ronix-design handle minimizes vibration and enables continuous low-fatigue work -SDS plus bit system provides tool free bit changes with automatic bit locking and maximum impact energy transfer -Lock button switch for comfortable working in continuous operations -Safety torque clutch system designed to guarantee operator's wrist during high torque force -Die-cast aluminum housing enables lightweight, superior heat dissipation and enhances body strength