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 Jason Bolden

Bought this to be used with a Harbor Fright angle grinder. This grinding wheel is bit unusual to mount on the grinder when compared to regular disk which seats on the arbor. But this one seats above the arbor, so I tightened nut as best and the wheel seems to center well and no wobbling while operating. And it did the girding of concrete stepping stone under a door like a champ.