Bosch IDH182-02L 18-volt Brushless Socket Ready Impact Driver with 2.0Ah Batteries, Charger and L-Boxx-2 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 Brushless Motor: Up to 2X the motor life, superior efficiency for longer runtime and no maintenance Advanced Electronics: Electronic Motor and Cell Protection help prevent overheating and overloading for extended tool life and runtime Performance Control System: Select between 3 speed and torque settings to maximize power or minimize fastener damage Superior Ergonomics: Smallest grip diameter for best in class ergonomics and comfort