I purchased this tool to make brass rings for stained glass lamps. 3" rings at the top.......larger for the bottom. Only tried it once. Tool worked well. I am using brass rod, so it is reasonably soft metal. Easy to set up and use. I purchased a similar tool from Harbor Freight.....turned out to be a chunk of junk. This tool was a bit more expensive, but seems to be much better made. It is going to do the job I want it to do.