$60.99 Kobalt 24-Volt Max 1/2-in Drive Cordless Impact Wrench (Bare Tool Only) at Lowes.com
Trades Pro 24 Volt Cordless Impact Wrench, 1/2 Drive, 240 ft-lbs, 837212 689737662998 | eBay
Makita 18V LXT Lithium-Ion Brushless Cordless High-Torque 1/2 Inch Square Drive Impact Wrench 
