We have steps in the back of the building, at the back door. I got that all renovated and they added a storm door that swings out. It turns out that the steps are slightly tilted nowadays. (I think this place was built in the '60's out of concrete and cinder blocks.) So, I put this on my 6 inch Dewalt cordless angle grinder and it just chewed away at that concrete! I had to take one break due to all the concrete dust making it almost impossible to breathe. When that blew away, I hit it again and I was done! I had probably taken about a quarter inch off a two to three square foot area in a very short time. And I get the impression it would do that a few hundred more times if I needed it to. Works great!