I have the one inch "Earthquake" from Harbor Fright. I bought it when I was taking the body off a firetruck I bought. It is a stud duck at ripping big stuck nuts and bolts loose. It will even do lug nuts that have been on a while. The down side is the battery charger and spare battery are sold separately. If you are a mechanic and use your tools every day go for the high dollar name brand stuff. If you only need the heavy artillery occasionally try the Harbor Freight stuff. I have the Earthquake cordless impact, a 12 inch Compound Miter saw, a set of one inch sockets, ratchet and pull bar and they serve me well on occasion.