The Bosch GDX18V-1800 Two-in-One 1/4 In. and 1/2 In. Bit/Socket Impact Driver/Wrench is for use with bits and sockets, going from impact wrench to impact driver fast. It lets you do two jobs with one tool, 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. The impact driver/wrench?s efficient, powerful brushless cordless motor produces up to 1,800 In.-Lbs. of torque, while the Bosch hammer-and-anvil system provide maximum impact energy and up to 0-4,200 impacts per minute. The variable-speed trigger provides accurate driving speed. The two-in-one bit/socket drive increases both convenience and power. Bits can stay conveniently inserted when using deep sockets, and more torque is transferred directly thru the 1/2 In. square drive anvil. There is no more torque loss through socket adapters or broken socket adapters. The driver has an LED light to illuminate the work area. The kit comes with one 18V 2 Ah Standard Power Battery and an 18V charger.