M18 FUEL 3/8″ Compact Impact Wrench w/ Friction Ring Kit. The M18 FUEL 3/8″ Compact Impact Wrench is the Most Powerful tool in its class by delivering up to 210 ft-lbs of torque in a compact design. The POWERSTATE Brushless Motor not only provides unmatched power, but also provides greater efficiency, delivering up to 20% more run-time than the leading competitors. 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 Batteries (not included) 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 0-900 RPM in Mode 1, 0-1600 RPM in Mode 2, and 0-2500 RPM in Mode 3. Auto Shut-Off Mode intelligently detects when the tool has Impacted on a fastener for one second and automatically shuts the tool down, reducing the likelihood of overdriving and damaging materials.