Review on Sunjoyco 4-Inch Diamond Cup Grinding Wheel - 12-Segment Heavy Duty Turbo Row Disc For Concrete, Granite, Stone, Marble, Masonry And More by Andres Callahan

I wanted to get my front porch back to bare concrete so I can stain it VS paint. This is slow but is working great and with half of my porch done, there's still plenty of blade left to finish. It doesn't fit centered initially but with the locking washer it holds just fine and for me has been centered. Do be careful as you can easily gouge the concrete if not careful. I found that using circular anti clockwise motions worked best. Just don't hold it in one spot and it works beautifully.