The largest log that the splitter has gone through so far is one that was 16 inches long and 22 inches round and the boss went right though it without any problem. I have split about 30 logs so far all of them were 16 inches long and the circumference varied from 17 round all the way up to 22 inches round.
https://www.amazon.com/Boss-Industrial-ES7T20-Electric-Splitter/dp/B00GNSCGIW

