The Bosch HDH183B 18V EC Brushless Brute Tough 1/2 In. Hammer Drill/Driver features KickBack Control and a precision clutch. KickBack Control is an integrated acceleration sensor that automatically shuts the tool down when a potentially dangerous rotational torque reaction occurs in a bind-up scenario. The precision clutch has 25+1 settings, for reduced over tightening, fewer damaged screw heads and a longer tool life. Its efficient EC Brushless motor delivers outstanding runtime and longer motor life. It generates 663 In.-Lbs. of torque and a no-load bpm of 0-31,500. This drill has a variable-speed selector, designed for high-torque driving (0-480 rpm) or high-speed drilling (0-2,100 rpm). With an upgraded, all-metal chuck, the drill has great bit grip and torque transfer. The HDH183 features Bosch's Electronic Motor and Cell Protection, tough Durashield housing, an LED for illumination and a long belt clip. This is a bare-tool kit; the battery and charger are sold separately.