The Bosch IDH182 01L 18 V Brushless 1/4 In. and 1/2 In. Socket Ready Impact Driver is a pro ready tool. If users want flexibility, the Socket Ready adapter has a 1/4 In. hex and 1/2 In. square drive in one tool. A Performance Control System has three speed and torque settings, and the tool is powered by a hassle free EC brushless motor. The hammer and anvil system that delivers maximum impact endurance, and the tool provides superior ergonomics, with the smallest grip diameter in the class. Includes battery.