Bosch GDX18V-1800CB15 18V Brushless Socket Ready Impact Driver 4.0Ah CORE Compact Kit The Bosch Freak is half wrench, half driver, all impact. The GDX18V-1800CB15 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 a CORE18V battery, which has next-gen Li-ion 21700 cell technology for optimal performance in a lightweight, high-power battery. The impact drivers 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. Bosch GBA18V40 18V CORE18V Lithium-Ion 4.0Ah Compact Battery The Bosch CORE18 V Compact Battery is the next-gen Lithium-ion battery to keep the power and runtime, while losing the weight. The GBA18 V40 single-layer battery features advancements in design to reduce resistance and increase efficiency, to improve the performance-to-weight ratio of tools used on the jobsite all day. Engineered with 21700 cell technology, the battery matches the power from the original two-layer 4.0 Ah battery with improved performance per cell. Bosch engineered the exclusive CoolPack 2.0 technology to manage the heat of the higher power-density cells, and it provides better cooling than the previous-generation CoolPack system. CoolPack 2.0 cools the battery 15% faster than previous 4.0 Ah double-layer versions.