Milwaukee 9057-6 12 Volt 3/8-Inch Square Drive Impact Driver Kit 3/8-inch and 1/4-inch drive size; 12 Volt Variable speed: 0-1500 rpm; 0-2200 bpm; max. 720 in.-pounds torque; reversing Rugged, impact resistant housing Electric brake instantly stops tool with release of trigger switch Limited warranty, 30-day no-risk trial