Bosch IDH182B Bare-Tool Brushless Socket- Ready Impact Driver 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 2 times motor life, superior efficiency for longer runtime and no maintenance Performance Control System- select between 3 speed and torque settings to maximize power or minimize fastener damage Highest torque in its class - highest torque output in its class at 1650 In/lbs Superior ergonomics- smallest grip diameter for best in class ergonomics