The Bosch 18V Lithium-Ion Freak 2-in-1 Bit/Socket Impact Driver and Hammer Drill Driver Combo Kit with two CORE18V Lithium-Ion batteries combines drilling and driving versatility with next-gen Lithium-Ion 21700 Cell technology. The GXL18V-251B25-RT combo kit features the GDX18V-1800C Freak: Half Driver, Half Wrench, All Impact. The impact driver has a 2-in-1 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 1800 in-lbs. of torque. The GSB18V-535C Compact Tough 1/2 in. Hammer Drill Driver has KickBack Control technology, up to 535 in-lbs. of torque, 0 - 28500 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. The kit includes (2) next-gen CORE18V 4 Ah Lithium-Ion Compact batteries. Each keeps the power and runtime, while losing the weight, with 21700 Cell technology. The CORE18V matches the power of the original 2-Layer 4 Ah Lithium-Ion battery with half the number of cells. It features the CoolPack 2.0 Heat-Management System. Compact power 18V combo kit - includes 2 tools (impact driver and hammer drill) for power, with (2) CORE18V 4 Ah Lithium-Ion batteries Half Driver, Half Wrench Freak - features a 1/4 in. quick-change hex shank and a 1/2 in. square drive, for either bits or sockets Compact CORE18V 4 Ah Li-Ion battery - engineered to provide next-gen power and runtime, while losing the weight Next-gen Hammer Drill Driver - engineered with Bluetooth connectivity (with optional Connected Tool Module), KickBack Control and more Bluetooth connectivity - uses an optional Bosch Connected Tool Module to connect both the Impact Driver and the Hammer Drill Driver to the free Bosch Toolbox app on a connected device, to customize settings and provide detailed feedback