This drill and driver set contains the new lighter rotor motor, which is lighter and more powerful than the old one, giving the drill / driver the same power despite lighter weight and a more compact design. The drill is very powerful with its torque of 600 in-lb and speeds (0 to 1,900 rpm to focus on speed and 0 to 500 rpm to focus on torque). The robust mandrel provides better strength and better torque transfer. Since it is a keyless chuck with Auto-Lock type, it is possible to change the bit or bit easily with one hand. This cordless drill features the Bosch Compact Tough ™ design - weighs only 3.5 lbs and has the shortest head in its class (7.0 inches long). It is a tough and powerful drill that can be used for the hardest materials.