This is a quality tool, not the cheap made in China junk that costs one third of this one and won’t get the job done. Well designed with hardened steel. I used it on 2.5” stainless steel pipes to expand up to about 2.560. You will need to rotate it often and move it in and out to get a decent round size using vernier measuring calipers. Hit it with a flat file when your done to smooth it out to size and assure a good fit/seal.