Bosch CLPK250-181L 18-volt Lithium-Ion Brushless 2-Tool Kit with Hammer Drill/Driver, Socket Ready Impact Driver, 2 Batteries, Charger and L-BOXX-2 Brushless Motors: Up to 2X the motor life, superior efficiency for longer runtime and no maintenance Socket-Ready Chuck: All-in-one Impact Driver and Impact Wrench with a 1/4-Inch Quick-change Hex and 1/2-Inch Square Drive chuck for sockets Superior Power: Most powerful brushless compact hammer drill driver in its class capable of performing the broadest range of heavy duty applications Advanced Electronics: Electronic Motor and Cell Protection help prevent overheating and overloading for extended tool life and runtime Superior Ergonomics: Smallest grip diameter for best in class ergonomics and comfort