The Bosch 2-Tool Combo Kit with two CORE18V next-gen Li-ion 21700 cell technology features two tools designed to deliver professional cordless drilling and driving performance. The GXL18V-239B25 kit features two CORE18V batteries that provide next-gen Li-ion 21700 cell technology in lightweight, high-power batteries with all-day performance. It includes a GDX18V-1600 Freak Bit/Socket Impact Driver that has a two-in-one chuck that offers a 1/4 In. quick-change hex shank with power groove for bits, and a 1/2 In. square drive for sockets. Its motor produces up to 1,600 In.-Lbs. of torque and up to 0-3,600 impacts per minute. The HDS181A Compact Tough 1/2 In. Hammer Drill/Driver has an upgraded metal chuck, and its motor delivers the same power as conventional 18V motors in a more compact size. It produces 600 In.-Lbs. of torque, up to 27,000 bpm in hammer mode and two drilling speeds (0-1,900 rpm for high speed and 0-500 rpm for high power).