3 Pieces 4 Inch Concrete Stone Ceramic Turbo Diamond Grinding Cup Wheel,12 Segs Heavy Duty Angle Grinder Wheels for Angle Grinder (Yellow)

I bought this item for a one time used. It sanded the uneven pavement down to my liking. Used less than 5 minutes without grinder shroud, got very dusty during used.

This grinding cup is well worth the money. Ive used on stone, brick and concrete and its never failed. Works as well as cups 3x the $$. This size is easy to control with one hand and great for working single pieces and small areas.

I used this grinding disc to smooth out a concrete pad to display a tree carving. It made the job so much easier. I used it to wet sand and polish the pad before sealing it.

This is a good buy worked great

I used one of the 2 that I purchased on a small area but didn’t last as long as I thought it would but did smooth concrete nicely.

If you have a low power grinder and arent in a hurry, these might save you some money. If you have a decently powered grinder and are willing to pay a bit more to get the job done faster with less work, there are better options. I had a project to grind down a concrete door sill. I had to remove between 1/8 to 3/8 of concrete over a 8 x 6 area twice. I started with a similar grinding wheel from Harbor Freight (Bauer 4 In. Diamond Turbo Cup Wheel). I had an assistant running water over the work area, which kept the dust down and the wheel cool, but made a muddy mess to clean up. I completed about 90% of the job and used maybe 3/4 of the grinding wheel, but it became unbalanced which was made worse by the bearing on the angle grinder getting wobbly. I got another cheap angle 4.3A grinder from Harbor Freight (HF), but decided to try these JIAKAI grinding wheels since they cost $10 for two instead of $30 for one at HF. When I started using these they seemed to be cutting much slower than the HF one had. I tried the HF one again (which didnt shake as bad with a good bearing on my new grinder) and confirmed that it was cutting a lot faster. Comparing the surface of the wheels after grinding for a while, it appears that the JIAKAI wheel has fewer diamonds embedded in the steel, and they appear to be smaller. What I did find was that with the HF wheel, since it bites in more and removes material faster, it takes more power and causes the grinder to heat up rapidly. I would spend more than half of the time with the grinder off sucking air through it with a shop vac to cool it off. With the JIAKAI wheel, it doesnt take nearly as much power so I didnt have problems overheating the grinder. I didnt run continuously since I would pause to examine my work, but I didnt have to take breaks specifically to cool it down. Of course it was more tiring because I spent more time actually grinding. I finished up the job with the JIAKAI wheel since I figured the vibration and overheating might wear out my new grinder, and it worked okay. Im estimating that I used about 25% of one of the wheels to finish the last 10% of the job, so Id guess that one HF wheel would do as much grinding as between 3 and 6 of the JIAKAI wheels, so with the much cheaper price, the JIAKAI wheels may be more economical (not counting labor). So if I was going to do this project again from scratch, Id seriously consider buying a more powerful grinder that could handle the harbor freight wheel. It would have been much more tiring doing the whole thing with the JIAKAI wheel, but if I eventually use these two up on small projects and have another small grinding project, I might get another set. Other observations: The JIAKAI wheels gave off an odor that reminded me of burning matches (Sulphur?) that the HF one did not. The flat area in the middle of the JIAKAI wheel was smaller than the nut used to hold it on, so the nut pressed against the angled part of the cup. It seemed to hold it securely anyway, but it wasnt how I expected it to fit.

So I had a lot of mortar left on the floor under the Durock after ripping up the tile floor. I attached the wheel to my DeWalt grinder (I used the included washer) and started sweeping it side to side like I was wiping the floor. It ground off the mortar like butter. Within 2 minutes I had cleared about 12 square feet. In the pictures I am showing about a one square foot of mortar. The second pictures shows the thickness, about 1/4. In fact there was part of a screw remaining down in there. It whipped that area clean to the wood within 15 seconds, including the screw (sparks). It requires zero pressure, it just eats mortar and any nails or screws get ground down too. I will say that goggles and mask are a must. The amount of dust in the room made it impossible to see what I was doing every couple of minutes. By the time I was done, 15 minutes of actual grinding on a 10x10, my hair was coated in a thick powder and eyes burning. Basically I would stop every couple of minutes due to not being able to see through the dust. After about 30 minutes it settles and I went back to it, stopping periodically due to thick dust. The first wheel looked like it had been hardly used after doing this room. It makes the wood look almost brand new like a sandpaper machine. I dont know what it would do to a concrete floor if you needed to grind an area, but Im sure it would be worth trying. Well worth the money and you get two wheels!

I bought two diamond grinding cup, only received one, i requested for the second i have not received a response

The blade fit my older Makita 4” angle grinder. Worked fine though we had more cement to remove than anticipated. Ended up buying a larger angle grinder but these blades are a great value for the price.

This grinding cup is well worth the money. Ive used on stone, brick and concrete and its never failed. Works as well as cups 3x the $$. This size is easy to control with one hand and great for working single pieces and small areas.