The M12FPP2A-421B M12 FUEL Power Pack 2A is the most capable and most compact 12V hammer drill driver and impact driver combo kit on the market. Included is the M12 FUEL 13mm Hammer Drill Driver, the most capable, lightest weight and most compact 12V hammer drill in the market. At only 167mm and 1.27kg of weight it is the best 12V hammer drill/driver to use in compact spaces. It delivers the power to do a wide variety of applications at 1700 RPM’s and 39.6Nm of torque. Also included, the M12 FUEL ¼” Hex Impact driver, the fastest driving speed, most compact with 4- Mode drive control impact driver in the 12V market. At 3,300 RPM the impact drives screws over 20% faster than M12CID-0 at 129mm in length 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.