Combo kit includes M12 FUEL 1/2 In. hammer drill/driver (2504-20), M12 FUEL 1/4 In. hex impact driver (2553-20), M12 REDLITHIUM 2.0 Ah compact battery pack (48-11-2420), M12 REDLITHIUM XC 4.0 Ah extended capacity battery pack (48-11-2440), (2) belt clip, and contractor bag. The M12 FUEL drill driver (2504-20) is the lightest weight and most compact 12V hammer drill at only 6.6 In. and 2.8 Lb. of weight. It is the best hammer drill to use in compact spaces. Delivers the power to do a wide variety of applications at 1700 rpm and 350 In./Lb. of torque. The M12 FUEL 1/4 In. Hex Impact (2553-20) offers a compact tool, fast driving speed, 3300 rpm, and 4-mode DRIVE CONTROL. The 4-mode DRIVE CONTROL provides greater control over output speed and power for greater versatility by delivering 0-1300 rpm in Mode 1, 0-2400 rpm in Mode 2 and 0-3300 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.