JINGLING 2Pcs 20mm 3/4" inch Diamond Hole Saws Granite Drill Bits Masonry Tools for Stone

They work as good as good as the ones from the big box stores and at a much lower cost.None of them last forever but these performed fine. I use them to cut through stucco for running cable, conduit, and pipes.

I didn’t have a lot of confidence that these worked that well but for the price it was worth a try. I thought no way would they work without using a hammer drill. Was I wrong! Cut through my brick like butter. I was pleasantly surprised. The only issue I had was didn’t go deep enough for my application and couldn’t add an extension due to the shaft’s odd shape. All in all I’d definitely buy again.

I needed to drill 4x 5.5 gallon tanks with thin glass, and I'd read it can be pretty sketchy without support. I made a guide out of plywood and used a scrap for backing, used painters tape on the inside of the glass to hold it together as the drill went through. I used a cordless drill on the lowest setting and speed, and filled the guide hole with water. The water didn't need to be refreshed during drilling, it didn't leak until the hole was drilled through.These bits start off with a pretty thick abrasive, and it gets eaten away pretty quickly, you can see the difference between a bit after 3 holes and a new one in the pictures. The 3rd hole was the worst of them, and I wouldn't do another tank with that bit, but it was good enough to work with the bulkhead. These are cheap cheap bits, but as long as they're not bent or something they do work, and I wasn't willing to spend $30 for a bit for a $12 fish tank. Overall I'll definitely buy these again, I have more to do and although they're basically disposable, I paid about $1 per hole, and a more expensive bit would wear out eventually anyway. The hole size seems accurate, as I used a 28mm regular hole saw to drill the guide, and these were a tight fit but they did fit.

These saws work great.

Needed to cut two 3/4" holes in porcelain tile. I was very doubtful that they would do but very pleased at the results. I used a drill press rather than a hand drill simply because I knew it would be very difficult to hold a hand drill steady enough to get the bit started. Using a drill press also made it much easy to spray water on the bit while drilling. I drew crosshairs on the tile the aligned the four slots in the drill with the crosshairs to assure it was centered. By using a slow speed and steady pressure the bit cut in an made a perfect round hole in the tile. I highly recommend these bits. Don't know how many holes may be cut with one bit but the 2nd hold went just as easily as the first.

Works very well! I used it to drill a hole in the bottom of a ceramic flower pot and it worked great!

I bought these inexpensive bits not expecting much from them. Had to drill two holes in 3/4" Quartz. I figured that 5 would the job done. Well, it only took 2 and, even then, thats really only because the Quartz piece got lodged in one of them and I couldn't get it out so I had to use another. The same bit could've cut both holes without missing a beat here.I doubt they're as good as the 40 dollar bits I see all over the place, but they're also a fraction of the price and work just fine. For comparison, my two used bits next to a new bit, as you can see both have some life left in them.The key, of course, is to keep them as immersed in water as possible and not overdo it on drill speed. I had them in an 18v cordless drill and wrapped plumbers putty around the cuts, which I filled with water. The cuts took a couple of minutes each but it worked. For less than $10.I would absolutely buy these again for any light duty stone project but I have a feeling I won't need to for a while since I have so many left.

Worked OK but the holes are not very precise. I ended up spending the money for a Lenox hole saw with a seprate carbide tipped arbor. I could use the arbor for different size hole saws and the saw did not want to "walk" all over the place. Much more accurate. More expensive but worth it. The carbide tip was rock solid on hard porcelain tile.