The 2598-22 M12™ FUEL™ 2-tool Combo kit is the most capable and most compact 12 Volt hammer drill driver and impact driver Combo kit on the market. Included is the M12™ FUEL™ hammer drill driver (2504-20), the most capable, lightest weight and most compact 12 Volt hammer drill driver in the market. At only 6.6 and 2.8 lbs. of weight it is the best hammer drill driver to use in compact spaces. It delivers the power to do a wide variety of applications at 1700 RPMs and 350 in-lbs of torque. Also included, the M12™ FUEL™ hex impact (2553-20), the fastest driving speed, most compact with 4- mode drive control impact driver in the market. At 3,300 RPM the impact drives screws over 20% faster than competitors. At 5.1 in. L it allows for unmatched access in tight spaces. The 4-mode drive control provides greater control over output speed and power for greater versatility by delivering 0-1, 300 RPM in mode 1, 0-2, 400 RPM in mode 2 and 0-3, 300 RPM in mode 3. Mode 4 is self-tapping screw mode which is designed to reduce walking when starting self-tapping screws as well as reduce overdriving, breaking and stripping out screws.