There just a big wood screw to split wood . I got the bright ideal to put one on the earth auger well it didn't work very good . It was way under power about all it did was get stuck in the wood . Now I have to decide to get a pipe wrench out or cut it out and not ruin a chain . What I have seen when they work is on a hydraulic machine of some kind . There is always that decsion what to take to the woods ? I could take a log splitter back to the woods and would be a major pain . I seen times when how are getting out here . Logistics in the woods are on very pro level or very lucky .