The M18™ FUEL™1/4 in hex impact driver is the most powerful tool in its class. At 1800 in-lb 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 to 3000 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. REDLITHIUM™ 2.0 compact batteries 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.