$69.99 BOSCH Cordless, Impact Driver, 1/2 in Square, 1/4 in Hex, 18V DC, 1,600 in-lb Max. Torque 
DEWALT 18-volt 1/2-in Drive Cordless Impact Wrench (Battery Not Included) at Lowes.com
MOSS High Torque 24v 1/2 Drive cordless impact wrench with 1 Hour Charger | eBay
