Review on 💎 Tanzfrosch 2 Pack 4 inch Diamond Cup Grinding Wheel: High Performance Turbo Row Grinding Disc for Concrete, Granite, Marble, Rock, and Cement Polishing by Serotonin Collazo

Bought a hard diamond grinding wheel from Orange Box at a much better price. But the hard one is 4.5" instead of 4", and it screws directly onto the 5/8" shaft of most angle grinders. This one has a 3/4" hole for the shaft and needs to be attached to the grinder will. locknut. But the biggest problem is that this disc doesn't grind concrete very well. It's like using 220 grit sandpaper instead of 60 grit sandpaper. It leaves a smoother finish but takes forever to get the job done. If your time is worth $0.50 an hour, you'll be happy with that. But when you want to finish a project, it takes 4 or 5 times longer.