Bosch GDX18V-1800CB25 Impact Tough™ 8.2" Bit/Socket Driver Kit 18V with (2) 4.0 Ah Core Compact Batteries combines a versatile two-in-one impact driver with next-gen Li-ion 21700 cell technology. The GDX18V-1800C Two-in-One 1/4 In. and 1/2 In. Bit/Socket 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. The kit features two CORE18V batteries, which have next-gen Li-ion 21700 cell technology for optimal performance in a lightweight, high-power battery. The impact driver’s efficient, powerful EC 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 driver has an LED light system to illuminate the work area.