Bosch HDS181AB Bare-Tool 18V Lithium-Ion 1/2" Compact Tough Hammer Drill/Driver Durable, heavy-duty chuck for better bit retention and great torque transfer Innovative, lighter 18-Volt canned motor is more compact but the same power Compact Tough design is the shortest head-length in class for maneuverability Tough motor  all-day productivity with 600-Inch-Lbs. of torque Full hammer mode for masonry  up to 27,000 bpm