Tungsten Carbide Grinding Wheel Disc, 3 Pieces 4 Inch 5/8 Inch Bore Wood Carving Disc Wood Shaping Wheel Wood Grinding Shaping Disc for Wood Cutting Shaping Polishing, Gold and Black

Yes that's right. Ryobi's spindle is just too big to be able to use it. However, it absolutely fit my cheap harbor freight grinder! Fit perfectly! So look at the spindle size before you buy. Of the three disks only one had a few teeth were folded back, like 3 of them. Looks like they are packaged well. They do the trick.