Review on 7" Diamond Grinding Wheels For Concrete Or Masonry, 24 Turbo Segments, 30/40 Grit, Medium Bond, 5/8"-11 Arbor by Kenny Rossi

This wheel grinds 100 year old concrete slab like butter. I put it on my Hitachi 1800w grinder and go to town. It's so quick, I had to learn to finesse the edges with a delicate touch, not unlike applying stucco. I've used this about 20 hours and yes, it shows wear; but continues to grind as it did when new.