Grinding Wheel, Double Row, Diamond Cup, 4-1/2-Inch (DW4774)

Works great and this was the best price I found. I used it to grind down the entire top of foundations on 2 1600 sqft houses. It has plenty of life left in it so I ground down some six 1-inch-high concrete corners on a garage approach. The houses foundations took about an hour each and the concrete corners took about 15 minutes each. Dust level is very high so I would recommend at least an N95 mask.

I use this cup wheel on a very regular basis and it is awesome for cleaning and correcting masonry openings for new door and window installs. Cuts very aggressively yet leaves a nice finish. I have used my wheel hundreds of times on commercial projects and it still works great. I bought an identical replacement today because I am guessing mine will eventually die or perhaps it has slowly dulled a bit over the years without me noticing, but truth be told I can keep using my old one if I want to. Rebar does not kill it. Heat does not kill it. Hard pressure does not kill it. Caulk and paint do not clog it up. Double row is not a gimmick, it really removes a lot of material and it also helps keep you flat so you do not gouge. If your time is money, then this is the cup wheel for you. Works great on good cordless grinders too (Milwaukee for me)

I have surface ground about 20 square feet of painted concrete block with this wheel so far and it barely shows signs of use. It removes material quickly and leaves an smooth surface as long as you keep it moving. If you stop it will dig in fast. It creates a massive amount of dust so a full face respirator is highly recommended. If used indoors tarp and tape the area solid with a window open. The dust will fill your basement in no time flat. The dust shroud I purchased didn't help much. My 12 amp Milwaukee got hot fast since this wheel is very aggressive so it will likely burn out a cheap grinder pretty quickly. Good product.

We recently had to replace about a thousand square feet of outdoor tile on a concrete slab. We had done a similar project two years ago on an adjacent area, so knowing what we were getting into, we bought several wheels to help remove the old thin set. We used a new DeWalt 13amp grinder with all of them. On the previous project we used the "4 inch Diamond Segment Grinding Cup Wheel Disc Grinder Concrete Granite Stone" (blue disc) at just over eleven dollars and it worked well and lasted for about 350 square feet. We decided that this time we would try several to see if we could get more square footage out of a blade or more importantly, if we could work less hard to remove the material (i.e. we hoped another blade would be more aggressive and reduce the effort needed). Following are all of the blades including the one this review is attached to. We hope this breakdown will help. DeWalt DW4774 4-1/2" Double Row: . This blade seemed to be the best of the bunch, but at thirty-five dollars, we question whether or not it was noticeably superior enough to justify the cost. As to durability, we finished the last 200 square feet of the project with this blade and it was still going strong which might be the justification for the price. OCR 4" Concrete Turbo Diamond Grinding Cup Wheel Three Row....: This wheel did very well and for the lower priced group lasted just shy of the 4" Diamond Segment Grinding Cup Wheel Disc... (Blue version). It ultimately lasted for about 300 square feet. 4" Diamond Segment Grinding Cup Wheel Disc... (Blue version): We liked this one the best of the inexpensive group (and have ordered extras). It consistently got about 350 square feet and seemed to wear out evenly. A really good buy for the dollar. Whirlwind USA GPST 4.5" Heavy Duty Grinding Cup Wheel: This was the most expensive of the group and at first we were very disappointed in it. After using it for a while though, we came to realize it is better suited for polishing work rather than fast removal of large amounts of material. It did not seem to wear much at all for the work it did and we will look forward to using it when we need to provide a smooth finished surface. For just grinding, don't pay the high price, it is definitely not worth it. 4" Diamond Segment Double Row Grinding Cup Wheel Disc.... (Black Version): This was the least competent of the bunch. It worked reasonably well but only lasted for about 200 square feet. At the end, it literally lost all of its teeth and was just a smooth flat wheel. The others in the twelve dollar range were much better buys. In summary, we feel that if you are only going to grind a smaller area of concrete (or like material) and it is not a massive project like ours, the inexpensive blades are a great buy and do just as good a job, if not better.

I used this to remove residual floor glue, thinset and cutback. Cut through it all. After removing the old glue down wood flooring from the concrete slab, I scraped the glue with a four inch razor scraper and then used this cup wheel on my grinder to remove all the residual glue. Turned out perfect. There was also some residual cutback underneath, and using a hepavac on the dust shroud and the correct mask, it removed it as well. After removing floor tile in a bedroom, and then removing most of the thinset with a thinset removal bit on my demo hammer, I again used the grinder wheel to clean up the rest of the leftover thinset. Removed it easily. After doing some epoxy repairs on the slab, I used this to clean it up after curing - easy! Be sure to use a good dust shroud on your grinder(I purchased the Dastool which worked great) connected to a strong ShopVac. Very minimal dust, but keeping the filter clean is a must. Oh, one more comment, I have done over 1000 square feet, and it is still going strong.

Seems like it will last a good while before wearing.

Purchased this item as the crew I hired to remove tile and thin set mortar on my sub floor did a poor/lousy job. Fired the crew and decided to do the job myself. When purchasing the diamond cup, I also purchased the Dewalt dust shroud which fit like a glove to my battery powered Dewalt angle grinder. Installed the diamond cup to the dust shroud and angle grinder. Low and behold, the grinder cup ate through the thin set like a hot knife in butter. The shroud which was connect to my Shop Vac removed 98% of the dust. Practically dustless. Great product (s). The only draw back on my experience was that my angle grinder was battery powered, which need recharging. If you have a non battery powered Dewalt angle grinder, you can cut through thin set and bits of tile all day.

DE LO MEJOR Y ME A DURADO , TRABAJE EN UN PISO DE 50 METROS CUADRADOS Y SE GASTO EL 30% MUY BIEN

Very effective for grinding down concrete. I used it to take layers of paint off outside wall. Used it for 5 days and still no wear. It needs practise to get it to work and leave a smooth finish. Its a workhorse but not a finishing tool

Even though it is a little bit expensive. It does the job very well. I used it to grind a concrete fireplace. IAlso it is very durable. I used it on my DW402 Dewalt angle grinder. Perfect fit. Just be careful with dust. You must buy a dust collector but please don't go with the universal fit cheaper version. I did it and had to returned it. The original dust shroud is more expensive but it should have a perfect fit.