The M18 Compact Brushless 1/4 in. Hex Impact Driver is the industry's fastest 18-Volt compact impact solution. REDLINK electronics and REDLITHIUM batteries deliver 3,200 RPMs for best in class application speed. Brushless motor technology provides 1,600 in./lbs. of torque, more runtime, and a more compact tool at 5.1, which means less trips to the charger and greater access in tight spaces. Fastest application speed 1,600 in./lbs. of torque 5.1 in. L Compact design: provides excellent balance and control, ideal for overhead applications or work in tight spaces IPM: 0-4, 200 RPM: 0-3,200 Milwaukee brushless motor: optimized for efficiency, this motor delivers more run-time and longer life REDLINK intelligence: advanced overload protection defends against abusive applications and monitors the temperature to prevent damage and ensure maximum tool and battery life REDLITHIUM battery: superior pack construction, electronics, and performance deliver more work per charge and more work over pack life than any battery on the market