The Bosch Impact Driver is half wrench, half driver, all impact. The GDX18V-1600 18V 1/4 In. and 1/2 In. Two-in-One Impact Driver delivers results, with the two-in-one bit/socket drive that offers a 1/4 In. quick-change hex shank holder with power groove for bits, and a 1/2 In. square drive for sockets. This innovative tool provides versatility while eliminating the use of socket adapters on a cordless drill. The impact wrench and driver's efficient, powerful cordless motor produces 0-2800 RPM and up to 1,600 In.-Lbs. of torque, while the Bosch hammer-and-anvil system provide maximum impact energy and up to 3,600 impacts per minute. The variable-speed trigger provides accurate driving speed. The driver has an LED light system to illuminate the work area. The kit comes with one 18V 2.0 Ah SlimPack battery and a charger.