Review on ⚙️ Gunpla 4-1/2-Inch Diamond-Cup Grinding Wheel: High-Performance Tool for Concrete, Granite, Stone, Marble by Kevin Harmon

Does not work with the grinder 4.5 inch porter cable applied. You cannot flip the jam nut like you would for a thin circle as it will not fit in the diamond cup that way. Update: Using a real turned 5/8 x 11 nut instead of a grinder jam nut it worked usable Then it proves to be worth the money Used it to sand a concrete slab in the kitchen where there are bumps Make your own dust cap out of cardboard with 2 holes one for the hands and one for the vacuum hose, taped shut I lined the top sighting hole down with foil from a saran and a battery powered LED flashlight, giving me a good enough view for observing and grinding while keeping the dust to a surprising minimum is reduced.