Glass Drill Bit, Lytool Dry Diamond Drill Bits Set 5 PCs - 5, 6, 8, 10, 12 mm, for Granite, Ceramic, Marble Tile Stone, Glass Hard Materials

Value for money , good quality , durable, decent precision

Really good, did the job really well on a couple of glass bottles....follow the instructions....keep the speed up don't press, let the weight of the drill do the work and dribble water over what you are doing....keeps the glass dust down and cools the item.....hope this helps.

The Arrow head drill bit is good, but I used the 5mm drill bit for 4 holes and is practically useless after 4 holes. Don't expect them to last too long. But for the money they're okay.

I bought a set of bits to drill through new porcelain tiles. The tiles are very hard and quite thick so drilling was tough. I managed to complete nearly all of the drilling tasks following a bathroom refurbish with the smallest bit but it failed on the last hole. I could have perhaps completed the job with one bit if I had been more diligent with the use of cooling water. I swapped to the next smallest bit to finish the job. For the price paid, I am quite satisfied with the product.

I have used only one of these drills, the 10mm, to drill a hole in a whiskey bottle for a lamp conversion. Whilst the hole was drilled successfully there are issues with the drill bits in my opinion. Firstly, the shank of the bit is round rather than the more commonly seen hexagonal which means that it is necessary to clamp it mor tightly in the chuck of the drill. The drill bit is hollow and to obviate the tendency to crush the shank when tightening the chuck the core has been filled with a plastic material. This means that, once the hole has been drilled it is impossible to remove the material that is left in the core of the bit, making it a one use wonder. I did, with some difficulty, manage to (maybe) render the bit useable again by putting it in a vice and using a punch to hammer the residue further into the core of the bit and expelling plastic from the shank end. This was only possible because whiskey bottles are made of thick glass. The pack of bits is relatively cheap - I sippose yu gets what you pays for!

I had to put a tv bracket on the new kitchen walls. I bought some carbide tipped drill bits off amazon. These would not touch the new wall tiles, trust my wife to buy top of the range wall tiles, they are probably porcelain I think. These diamond did the job quick, very pleased.

Good for the money

Take a bit of getting used too but when you’ve worked it out they work well! And aren’t blunt after couple of uses