Works great on breaking 6"concrete, we used it to day to break up some steps that we are repouring. It made for quick and easy work in breaking up the concrete. The hammer has some weight to it. It’s all metal construction. We had a smaller lady delivering the mail the day it arrived, so we had to get it off the postal truck. We only got safety instructions in our shipment but there several good instruction videos on utube and Pinterest that also tell you what type of oil you will need.