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

Product description states “2 pieces” and photo in written description shows TWO grinding disc’s. I only received one (1) disc. So, either the description is wrong or I was only shipped one of the two items. Mistakes can happen, it would be nice to receive both disc’s or be refunded a fair amount for one item. I have not used the grinding disc yet because I wanted to address the issue first.

Good product

I watched some videos on line using these to grind different things. These will not do it. Maybe the more expensive ones would. But not these.

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.

This is a good buy worked great

It does the job but not high quality, poor finish.

I needed to remove a strip of concrete for a screen door opening. I took off about 1/8 all the way across and had plenty of life left on the wheel.

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.

worked great to level out some bumps on bluestone under a pair of stair stringers. i was worried about going with the ultra-cheap wheels on amazon but it worked great. for the small project I had. With two concrete grinding wheel for <$10 one obviously would expect the world. But worked great for my small project and the wheel I used looks like it could handle a couple more small project.

I got a two pack of these the first one one of the pads on the bottom flew off after two minutes use. Extremely dangerous for anyone in the area. The second one wore out after about five minutes use. I returned these and bought a single pack of a different brand and it has about 30 minutes use on it so far and still works great.