The Ridgid 18V Brushless Cordless High-Torque Impact Wrench has a lot of the features one would expect in a higher-end product, like an auto-tightening mode to prevent over-torquing of bolts ...

For $270, the Metabo HPT 36V MultiVolt Cordless Impact Wrench produces 1475 ft-lbs of nut-busting torque and with auto slow and auto stop features. Compatible with any 18V or 36V MultiVolt battery ...