The Bosch Brushless 2-Tool Combo Kit with two CORE18V® batteries deliver professional cordless drilling and driving performance. The Bosch GDX18V-1860C is half driver, half wrench, all impact. This impact driver has a two-in-one bit/socket drive that offers a 1/4 In. quick-change hex shank for bits, and a 1/2 In. square drive for sockets. The impact driver's efficient, powerful brushless motor produces up to 1,860 In.-Lbs. of torque and 0-4,100 impacts per minute. It has special modes to prevent workpiece and fastener damage, including presets for self-drilling metal screws and wood screws. In reverse, with bolt mode activated, the Auto Bolt Release prevents accidentally dropping bolts and nuts during removal. The GSB18V-975C 1/2 In. Hammer Drill/Driver powers up to 975 In.-Lbs. of max torque and 0-31,500 beats per minute (bpm), but weighs only 3.4 Lbs. (tool only, not including battery). It has variable speed settings and a precision clutch with 25 settings. It has KickBack Control to reduce the risk of injury from sudden rotational torque reaction. The kit includes two CORE18V® Compact 4.0 Ah batteries, which each deliver 2x the runtime compared to previous generation BAT612 2.0 Ah battery.