The Makita 1-9/16" Rotary Hammer (model HR4002) has a powerful 10 AMP motor that delivers 2,500 BPM for the most demanding applications. The HR4002 includes a torque limiting clutch that is engineered to prevent gear damage by automatically disengaging gears if the bit binds. The "no hammering when idling" function helps increase tool life, and the soft grip handle provides increased comfort on the job. Powerful 10 AMP motor delivers 4.6 ft.lbs. of impact energy to handle the most demanding applications