The M18™ FUEL™ 1/2 in compact impact wrench with pin detent is the most powerful tool in its class by delivering upto 220 ft-lb of torque in a compact design. The Powerstate™ brushless motor not only provides unmatched power, but also provides greater efficiency, delivering upto 25% more runtime 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 to 900 rpm in mode 10 to 1600 rpm in mode 2 and 0 to 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.