The GXL18V-251B25 Bosch 18V 2-Tool Combo Kit with two CORE18V batteries combines drilling and driving versatility with next-gen Li-ion 21700 cell technology. The GXL18V-251B25 Bosch 18V 2-Tool Combo Kit features the GDX18V-1800C Bosch Freak: half driver half wrench all impact. The impact driver has a two-in-one bit -socket drive that offers a 1 -4 In. quick-change hex shank holder for bits and a 1 -2 In. square drive for sockets. It produces up to 1 800 In.-Lbs. of torque. The GSB18V-535C Bosch Compact Tough 1 -2 In. Hammer Drill -Driver has KickBack Control technology up to 535 In.-Lbs. of torque 0-28 500 beats per minute (bpm) and a precision clutch in a tool weighing only 2.7 Lbs. (tool only not including battery). Both tools feature Bluetooth connectivity to an optional Connected Tool Module and EC Brushless motors. GXL18V-251B25 Bosch 18V 2-Tool Combo Kit includes two next-gen CORE18V 4.0 Ah compact batteries. Each keeps the power and runtime while losing the weight with 21700 cell technology. The CORE18V matches the power of the original two-layer 4.0 Ah battery with half the number of cells. It features the CoolPack 2.0 heat-management system.