$52.99 CRAFTSMAN V20-Amp 20-Volt Max Variable Speed Brushless 1/2-in Drive Cordless Impact Wrench in 
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
