Product Description 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. From the Manufacturer The new HR4002 rotary hammer is sleek, powerful, compact, and ergonomically designed to increase your comfort as well as your production. Featuring a powerful 10 AMP motor, a no hammering option to aid in a longer life and greater performance of your tool, a soft grip to help your comfort and reduce the vibrations as well as a built-in torque to limit clutch disengagements if the bit jams and to ensure stable torque control.