Review on ⚙️ APLUS 5-Inch Turbo Diamond Cup Grinding Wheel, Grinding Disc for Concrete, Granite, Stone, Marble, and More by Yung Kaelin

This is one of the few 9 inch diamond cups I've been able to find and so far so good. I mainly plan to use it to smooth and smooth rough or lumpy concrete surfaces. The larger diameter should help make the parts flatter. I put it on a 7/9" Dewalt buffer/buffer with 5/8" to 7/8" nuts from another angle grinder. Fits snugly on the cup wheel, but works. It comes with a very thin 22mm OD x 20mm ID sleeve to make it fit. I do not know what? Look closely and you can see him sitting on the steering wheel in my photo. One minor issue was that the Chinese-made unnamed box didn't specify what max RPM it should run at, so I'm not sure that would work well on my 7" 7800rpm angle grinder, but I did just planning to use them on my polishing machine which runs at 3500rpm anyway.