$50.99 MILWAUKEE 1/2 Cordless Impact Wrench Kit, 18.0 Voltage, 220 ft.-lb. Max. Torque, Battery 
18v 1/2 Drive Li-on Cordless Battery Impact Gun & 10 Deep MM Impact Sockets | eBay
PORTER-CABLE 20-Volt Max 1/2-in Drive Cordless Impact Wrench (1-Battery Included) at Lowes.com
