Diamond Drill Bit, Hole Saw Drill Bits Tools Set for Glass/Tile/Ceramic/Marble/Porcelain Cutting, Hollow Core Drill Bits Cutter with Diamond Coating, Carbon Steel 8mm-50mm 10 PCS

Don't expect miracles with high precision flawless drilling and frankly, they are exactly what you get for this price. It does really well and they will last for a fair number of uses but not forever, which again, it *is* something you should expect. I drilled an entire deep ceramic pot and the result was stunning, would buy again if they wore out.

Bought on 29 August and used today 16 September.Drilling a 25mm hole into the thick porcelain of my oilet pan/bowl.Before use I read many reviews and complaints about the product and watched a few videos on how to use these drill bits.I sprayed the drill bit and area I was cuting, using lots of water, and I drilled very slowly only picking up speed as I got to about half way.The drill bit got through the toilet pan very easily and only a very slow speed was required. I used a battery operated combi-drill (hammer drill, drill, screw driver) and set it to screw driver mode as this offered the slowest speed. You have to start extremely slowly to get the hole started.The biggest headache is getting the hole started as I found that the drill bit had a tendency to skip across the shiny surface of the toilet pan. So that's when I set the drill to slowest speed and pressed down firmly in order to get the drill bit to "bite" into the material and start the hole. Once the hole was started I reduced the force I was using to press down on the drill such that only the weight of my hand was being used simply to keep the drill and drill bit steady and aligned straight.I learned from the few online videos I watched that even very expensive drill bits of this kind don't last very long. So with that in mind I decided to use a large amount of water when drilling in order not have the drill bit over heat and become useless.Because I was drilling into a flat horizontal surface water application was very very easy. For starters when the drill bit cuts into the surface it creates a trough, a circular valley, and this trough/valley is ideal for water application as it retains the water and the deeper you cut into the material the deeper this trough/valley will be and therefore the more water it will hold.I made up my mind that this was going to be a VERY VERY slow process and that I would be using lots of water. After drilling for a few seconds I would remove the drill/drill bit, then use a spray bottle to spray into the area I was cutting and also spray the drill bit on the inside, and outside of the cutting surface as well as the horizontal edge of the cutting surface of the drill bit; I repeated this process every six or so seconds.I found that doing that water lubrication process meant that the drill bit never got hot and cut through the thick toilet pan/bowl a lot quicker than I was expecting (it was of course a lot slower process than drilling into wood or masonry but all the same it wasn't as long drawn out as I was expecting).The thing to note, as mentioned before, is that there was no need to exert a lot of pressure on the drill; I simply allowed the weight of the drill and my hand in combination with the drill bit to do the work nice and steadily.Working on a vertical surface I would prefer to use cutting oil (or any oil designed to withstand extremely high temperature) as a coolant lubricant because it wouldn't be as runny as water.For the number of times I am likely to use these drill bits (hardly ever) and the number of holes I will need to drill (very few) this drill bit set represented extremely good value for many and there really is very little to complain about other than that it would have been nicer if there was some way of keeping or ensuring the drill bits are centred at a precise point/location (it's quite easy for the drill bit to skip out of your desired location as you start drilling).

Was going to buy one of these pieces for €25 before I found this set for less than €10. Did the job great. Prob will only get so much use out of them. But unless you are a tiler or plumber I don't see how you will use these too often.

One bit drilled two holes through a tile before it was completely worn out. So probably ok for a one-off job but that's about it

Just like you, I needed to put holes in tiles for a bathroom tjob. Wanted to make a decent fist of it so got these as complete set about the same price as one "proper" cutter. Tricky to use at first- watch the video in the product description to see how you angle the bit to get going then verticalise quickly after, and use a lot of water.On the downside, these don't have sizes marked on them, the chrome plating is poor (specifically on the drill shaft) and the size range is very narrow... but other products are available.NB also used to drill holes in LVT flooring, gave a very clean hole.

These hole saws are decent for occasional use. I've only used the 22mm one on a ceramic tile and it did the job without self-destructing which in my experience is about as much as you can ask of something at this price. I've never had a diamond saw that survived more than a couple of holes drilling through porcelain and I doubt these would be the exception.These look very like a set that was recently on sale in Lidl for almost the same price, albeit with a case. That makes them good value in my book. Weirdly the saws aren't marked with their diameters - you have to figure that out yourself.However, you will note that these saws don't use an arbor. What this means in practice is that it can be hard to get the saw to stay in place, particularly the larger diameters. As the product instructions suggest, you can tilt the drill and cut a little arc with one edge of the saw and then straighten the drill up and hope it stays in place.If you can't take the risk of scuffing or damaging the work area surrounding the hole, the ideal solution is to make yourself a jig for the hole saw to sit snugly into and stop it sliding around. To make the jig, you may well need another drill bit or hole saw that's meant for cutting wood because these certainly aren't.If you can have someone else dribbling water over the cut constantly then all the better. Don't go too fast or you will not only melt the saw but risk cracking your tile with the heat.If you want something that you can pass on to your grandchildren for many happy hours of hole drilling yet to come, I would steer you away from these, in the direction of Lenox, Starrett or Bosch. If you don't need all the different sizes, you may find one quality one in the size you need a better investment but expect to pay more than for the whole set of these.

I bought these as a set for making pipe holes in large stone effect ceramic tiles and the smaller ones for screw holes for attaching cupboards to the walls.I used the large 50mm one first for the waste pipe hole. It went well, I had the tile ready and it fit perfectly, the tile remained complete, didn't break or crack. But then I changed my mind with the layout of the tiles and so needed to drill the holes again, in another tiles because the position was wrong.I then found that the chuck spindle on the hole saw had bent on its first use so the second use was a nightmare, the saw was rocking all over the place and scratched the tile all around the hole.I don't know what these saws are made of but I should have got better ones.