Had to drill holes in floor and wall tiles for a glass partition. The bits worked as expected; no warping or wearing down too quickly.

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The 3/16-inch and ¼-inch drill bits are my favorite sizes on ceramic and granite tiles for DIY projects in my bathrooms and kitchens. Typically, I drill them on the grout lines rather than on the tile itself because it’s a lot easier. These bits are Diamond coated with cooling wax filled tip for dry drilling.My past experiences tell me that most diamond-coated drill bit is basically one-time use because it wears out so quickly. This kit provides 10 pieces to finish most DIY tasks--in the past, I had to make another trip to the big-box store to buy more bits to finish the job.I used one bit to test-drill a hole on a ¾ inch thick granite block. After 5-6 minutes of drilling, it drilled about 5/8 inches deep but it couldn’t drill through the block before my patience ran out. It wouldn’t go through the last 1/8-inch because the bit seemed to dull out or my patience ran out whichever came first. I used dry drilling and emptied the dust frequently through the test-drilling. It looks the end of the tip lost the biting effectiveness as shown in the photo.I think and expect this bit would be more effective in drilling holes on a thinner granite (or any other material) tile up to 3/8-inch thickness due the 3/8-inch length of the diamond-coated tip.I liked the kit because there are 10 pieces of my favorite hole sizes on a ¼-inch hex shank that fits most cordless hand-drill and the laser-engraved depth marking on the bit. But I felt the bit’s robustness and effectiveness is not what I expected or hoped. Also, it wasn’t easy to start a hole like any other diamond-coated bits I used in the past even though starting at 45-degree angle with care--it still wandered and skipped around to get it started.

They do the job and seem durable, I used the same bit to drill 8 holes into porcelain

This set includes 10 high-quality 5mm diamond drill bits, perfect for drilling into tile, ceramic, marble, porcelain, stone, and glass.

These bits worked great in the large format porcelain tiles in my new shower. Porcelain is really hard to drill through and these bits helped a lot. There are several in the pack and I went back and forth between two of them to make it through 4 holes. I drilled them dry so they heated up quite a bit, but that’s when I switched and it worked out pretty good. I don’t know about drilling them wet, but may work a bit better. Drilling them dry worked out good for what I needed so I didn’t try wet. The two that I used for the 4 holes could definitely be used again. These seem fairly durable and they didn’t show a lot of wear so I expect I could get a few more holes out of the pair.

Small but sturdy, and with a good amount of diamonds so should be able to get multiple uses from each. If you don't have a steady hand, you might consider a drill press as these can travel (especially on curved surface, like glass bottles).

I've seen more expensive 💸 bits but for these lower priced bits it's a great value.I like the quality of these dry bits I would say they are very easy to install into my power tool.They are lightning fast and speed I was through my porcelain tile super quick.They work 💯% as intended 👍🏽I recommend these Larouba vacuum brazed diamond drill bits.Note:All my tips arrived arrived new with this diamond bit 📐 set. 👍🏽👍🏽

This review is specifically for the Larouoba 3/16" (5 mm) diamond tipped drill bits.The first thing I need to point out is that the price on these is excellent, so that factors into my idea of the quality/value. These are definitely not the best, but I've paid 5 times more and only got slightly less than twice as much life out of them, so that's good math for home projects. If you need these professionally, the extra money might be worth the time savings. For private use, it's worth saving the money. At least it is for me.I need to apologize for not being able to review a major feature of these bits, which is the ability to drill dry. These are filled with wax that is supposed to melt as it heats up to create some moisture to cool the bit. I've drilled tile and stone enough to know how hot the bits get, and my brain won't allow me to think the wax would be enough, however in hindsight, for the sake of this review, I should have at least tried for one hole. It's simply habit, and it's very easy to spray the surface with a spray bottle before I start; so I did.If you've never drilled a very hard, brittle surface before, it is a slow process. You can burn yourself on a bit from a quick pass through wood, so if you can imagine 2-5 solid minutes of drilling tile or stone; that level of heat could set wood on fire. Without moisture, even tile and stone will be smoking. That's the idea behind the wax, but that's not the reason I ordered these bits. It was the price for a quantity of 10. All I can say is that if you try drilling dry and the wax isn't enough, simply mist the surface with a spray bottle a few times. That will keep it from smoking and will cut down enough friction heat to prevent damaging the bit or drill. The wax may accomplish that, but it's a good idea to have some water handy anyway. I tried to get a close-up of the back end of the bit so you can see that the wax is filled the entire length of the bit, as they are open on both ends. That is also normal, which is why you can't start drilling straight into the surface, you need to start at an angle until you get a dimple you can put the bit to rest in without it simply spinning the bit sideways and damaging the surface.If this is your first time using a diamond bit, also know that you need to move the bit back and forth constantly as you drill down. This means your hole will always be a little larger that the bit.What makes the price difference is primarily the diamond chips themselves and the quality control. The diamond chips are a bit larger, more sparsely dispersed, and not a very even coverage. I tried to get a photo as close up as possible of the tip as well.Drilling hard materials like this isn't a smooth or gentle process, so a course bit isn't a problem for the stone or tile. In fact, it would probably be more effective, but it actually damages the bit. More of diamond chips will break off before they wear off, and when they are bigger and more spread out, a missing chip has a bigger impact on the effectiveness of the drill. It won't feel dull to the touch, but it's dulling. Overall, this causes the bit to dull quicker than a bit that looks smoother with smaller diamond chips. The better bits look more dull to start with, but this is the point of using diamond. The tips of each of those smaller chips are just as sharp as the larger chips, but there are a lot more and they don't break off as easily.Bottom line is that you will go through these bits about twice as fast as a very high quality bit, but they are less than half the price. In many cases, those bits will be 3+ times the price. If you're not charging by the hour and you're not drilling 4-5 hours a day, it's definitely a better value than the high end bits, and it will get the job done in about the same amount of time, until the bit is dull.I'm not trying to teach anyone, but in many cases, people looking at the cheap Chinese options are those new to the game or only doing personal projects. I've done it professionally and for many years, any trade work is only for myself. I would not have used these on the job, because it's a lot more profitable to keep going and not need to step away or change bits twice as often. At the same time, that drilling was making me money, and now it only costs me money lol. I might go a year or more between any need to drill tile or stone, and even if a bit lasted forever, it's taking me a lot longer anyway. Out of practice and I'm not iny twenties anymore, so the time it takes to swap a bit is really insignificant to me.On that note, the 10-pack is great, because changing a bit doesn't waste much time, but drilling with a dull bit wastes a lot of time, and can ruin your hole. The moment a bit seems like it's getting dull, just change it immediately. The point of cheap is to make that less painful.Because of the value and the ability to get the job done, I recommend these bits for occasional use.