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

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!

Used these to grind down some Unleveled concrete slab in order to put down some hardwood flooring. Did the job as expected!

This is the second time Ive bought this item, so I certainly fairly satisfied with it. They wear out quickly, but are so cheap that they are a good value. If youre looking for a cheap throw-away item for one-time use, this is it. By the way, some reviewers said they got only one, whereas others said they received two. I got two.

Did the job I needed it to do smoothing out a concrete floor on a budget

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

Lasted about 15 mins and shot chunks of metal everywhere no where near durable nothing last similar disk I’ve bought and used. DO NOT BUY

Been using this on fieldstone for a month. Holds up great. Just as good as the more expensive versions. Great value.

Been using this on fieldstone for a month. Holds up great. Just as good as the more expensive versions. Great value.

Great deal for a package of two. They are probably not the most durable compared to more costly ones, but it served my purpose for evening out a bridged footing for deck stairs. I recommend!

Works really well, worth every penny. Used it to grind down some floor level that didn’t turn out level.