Here is my Impact Wrench review of the Milwaukee 9072-20. Milwaukee has been in the drill and impact wrench business for a long time. Their attention to quality is very evident in the 9072-20.
It features a pin dent system of retaining sockets and other adapters that are required to operate the impact wrench. It has a quick lock system, so you can switch the sockets extremely fast. No need to waste time with this impact wrench.
You can get over 300 feet pounds of torque out of this light weight impact wrench. It only weighs 6 pounds! That is an amazing ratio! Not many impact drivers have a ratio this great.
Do you have any rusted out bolts that need to be spun off? This drill can break those hard to spin nuts. This impact wrench is one that every garage or machine shop should have. The price is very reasonable, so you could buy more than one and have a back up.