Specialty Diamond 12RPW 1/2 Inch Radius Vacuum Brazed 65mm Premium Diamond Profile Wheel with 5/8 Inch x 11 Female Threads

I'm using it to put a nice round edge on my pools flagstone copping. It handles flagstone with no problem. It leaves a nice smooth rounded edge. I used a $20 grinder from HF. Had to grind about 130 foot of coping. the bit looked as though it were still new. It cut the flagstone and mortar with no problem. It only took about 2 hours to complete the job.

I have another with a lesser radius. It works great. Sprays a little water, you'll get wet, but I wear a piece of awning material. Of course you need the other discs in order to get a smooth finish. It's great to be able to shape stone. The product arrived quickly, The price was right.