The M18 FUEL™ 1/4 In. hex impact driver is the most powerful tool in its class. At 1800 in-lbs of fastening torque, this tool drives screws faster but also provides greater control over power and speed thanks to its proprietary 4-mode DRIVE CONTROL™. The POWERSTATE™ brushless motor delivers up to 0-3, 000 RPM with constant power output to drive screws faster. REDLINK Plus™ intelligence is the most advanced electronic system on the market, preventing damage to the tool and battery caused by overloading or overheating. For use with REDLITHIUM™ compact batteries or extended capacity batteries (sold separately), which deliver more work per charge and more work over the life of the pack than competitive batteries on the market. The 4-mode DRIVE CONTROL™ provides greater control over output speed and power for greater versatility by delivering 0 to 850 RPM in mode 1, 0 to 2100 RPM in mode 2, and 0 to 3000 RPM in mode 3. Self-tapping screw mode is designed to reduce walking when starting self-tapping screws as well as reduce overdriving, breaking, and stripping out screws.