Eastvolt 800W Electric Impact Wrench, Heavy Duty 7.5 Amp Corded Max Torque 450 Ft-lbs 3400 RPM, 1/2 Inch with Hog Ring Anvil - Amazon.com
DEWALT 1/2-in 10-Amp Variable Speed Corded Hammer Drill in the Hammer Drills department at Lowes.com
Amazon.com: Wagan EL2257 12V DC Mighty Impact Wrench, 1/2 inch 12 Volt Electric Impact Wrench Kit, 271 ft-lbs, Tire Repair Tools with Sockets and Carry Case : Everything Else
Milwaukee 8 Amp Corded 1/2 in. Hammer Drill Driver 5376-20 - The Home Depot