Dewalt DCF899HP2 Impact Wrench
DeWalt comes in with the most nut-busting power at 1,200 ft. lbs of maximum breakaway power, along with 700 ft. lbs. of maximum torque. That makes it the most powerful cordless impact wrench currently on the market. A little heavier than the Matco below, it comes in at 7.2 pounds. That's still rather light and the 8-13/16" overall length helps get it into tight places. This tool is built with a brushless motor, reducing maintenance by eliminating the need to replace the brushes. The anvil on this tool is equipped with a detent pin, the only thing I don't really like; but lots of other people like them, so I won't hold that against it. Speed is variable, with three ranges including 0-400, 0-1,200, and 0-1,900 RPM. It also includes a LED light with a 20 second delay to increase visibility while you are working.