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 Dave Baker

recd' in 2 days via prime. WOw WHoA. this grinder wheel is amazing. using a 4 1/2' basic grinder, installed the 4" wheel using the bushing provided and tightened down the disk nut from my grinder and everything was secure. floor tiles came loose in kitchen and couldn't match these 13" tile so had to grind off about 1/8" of mortar. fired up the grinder and this grinder wheel removed the mortar like butter down to where I could clean them up with a standard abraision wheel. this wheel still looks new after working over these13 13' tile. highly recommend this very aggressive grinder wheel for this application. good, quit researching buy it.