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 Andre Pendergrass

I have an old front concrete stoop which was coated with layers of paint (but also had peeled and ugly bare spots). I used this on a 4-1/2 angle grinder to grind away the old paint and level off the worn spots. It even took care of the original marks left by the boards when it was poured over 60 years ago.Bottom line, the stairs and landing look better than ever before. (I would have to paint them every few years.) This wheel did the job and was 1/3 the cost of a similar wheel at a big box store. Plus there is plenty of life left to tackle the next job. One warning: a ton of dust is created and may cause your grinder's life to be cut short unless you blow out the dust. Be sure to wear protection gear, especially a mask.