This Bosch 18V Bulldog™ hammer consistently outperforms the best-selling 1 In. corded 11255VSR Bulldog™, making it better than the best. The Bosch GBH18V-26K24A kit pairs two CORE18V 8.0 Ah PROFACTOR Performance Batteries with an SDS-plus® Bulldog™ 1 In. Rotary Hammer that delivers 1.9 Ft.-Lbs. of impact energy (EPTA). The hammer's brushless motor maximizes battery runtime for extended performance. It also has KickBack Control, an integrated sensor to stop tool rotation in bind-up situations; Electronic Precision Control, for smoother bit starts; and Vibration Control, for extended user comfort. It weighs only 8.4 Lbs. (with included battery). The kit features two CORE18V PROFACTOR Performance Batteries, which each provide 100% more runtime and over 75% more power than the CORE18V 4.0 Ah battery. It is designed to deliver power and performance for high-capacity tools. Each 8.0 Ah PROFACTOR Performance Battery weighs only 2.14 Lbs. for the ideal balance between size, weight and power. It is engineered with 21700 cell technology and the exclusive CoolPack 2.0 technology to manage the heat of the higher power-density cells. The Bosch GDX18V-1860C Two-in-One Cordless Impact Driver/Wrench provides one tool for use with bits and sockets. It goes from impact wrench to impact driver fast. 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 impact driver/wrench's efficient, powerful brushless motor produces up to 1,860 In.-Lbs. of torque and 0-4,100 impacts per minute. In addition to three speed/torque settings this impact driver/wrench also features special modes to prevent work piece and fastener damage. The presets include modes for self-drilling metal screws and wood screws. Additional modes and customizations for specific screws and materials can be set and saved to the tool via the Bosch Toolbox App (connectivity module sold separately). In reverse, with bolt mode activated, the Auto Bolt Release stops rotation when there is no load on the tool to prevent accidentally dropping bolts and nuts during removal. In addition to customizing settings and modes, connectivity (module sold separately), provides tool specific information and feedback. The variable-speed trigger provides accurate driving speed. It also has an LED light system to illuminate the work area. The Bosch CORE18V 4.0 Ah Compact Battery is designed to keep the power and runtime, while losing the weight. The GBA18V40 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. The battery is a truly flexible power system providing compatibility with a full range of Bosch 18V Li-ion cordless tools. The GBA18V40 is engineered with 21700 cell technology, matching the power from the original two-layer 4.0 Ah battery with improved performance per cell. The Bosch-exclusive CoolPack 2.0 heat-management system results in 15% faster cooling and 135% longer life compared to previous non-Bosch CoolPack 18V batteries.