The Chicago Pneumatic CP8748 1/2" impact wrench is rated at 425 ft./lbs., one of the strongest on the market. The most unique benefit of the CP cordless impacts is the easy-to-replace carbon brushes. Simply remove one screw for direct access. The CP8748 comes with either three Li-Ion or two Ni-Cad batteries. Each battery has a charge life of 300 cycles, and with two batteries you'll always have a full charge to get the job done. 3/8" Impact also available.