Makita XWT04Z, 18V LXT, 1/2" High Torque Impact Wrench
Makita offers this unit as either a bare tool or a kit but I've selected the bare tool, simply because I have other Makita tools, so I already have the batteries and charger. This one produces 325 ft. lbs. of max torque. The manufacturer doesn't list a breakaway torque, so I have to assume that there isn't one. One thing I like about this tool is that the handle is shock absorbent. This not only protects your wrists, but it also reduces fatigue on the tool thereby reducing chances that the handle, which is the battery compartment on all these tools, will break. This tool also is equipped with an LED worklight which illuminates your work area. It uses Makita's standard 18V LTX Li-Ion batteries.