Aiskaer60 Pcs Premium Diamond Drill Bit Cylindrical Burr Kit Jewelry Beach Sea Glass Shells Gemstones Lapidary.1mm 10pcs.2mm 10pcs.3mm 10pcs

Nicely packaged good selection of diamond coated drill bits. Work well. No need for much pressure, just drill carefully and keep covered with water. Seem to last well. Very pleased with these bits, would highly recommend. Very good price too.

i was aware that some reviewers had had problems with these, but i have to say that they have been absolutely fantastic to use, and i am sure i will be able to drill holes in a good number of pebbles before each one gives up. I think the key is to make sure you know what you are doing, and make sure you use some sort of 'burr life' to lubricate and prolong the life of the bit / burr. I found that these did not fit my pendant drill, but are perfect for my Dremmel, and use it in the Dremmel bench press set up. Of course you must sit your piece to drill in a shallow dish of water to cool the burr and pebble from friction heat, and please do take your time, don't push through too quickly. As long as you do your research and use these properly they will do a great job. I don't want to criticise any previous reviewers who gave this product a less than favourable review, but i think there may be a case of 'a bad worker always blames his/her tools' going on. SO take your time, do your research, and don't expect to be an expert if you have never done this before. I will definately buy these again.

Got these to drill some agates, and they did - eventually. First time I've tried to do it and I thought it would be difficult, and it was. The drill bit wasn't the issue though, I was! Take your time without forcing it too much, plenty of water and you'll get there. Agate are hard!!!

Some drill bits worked but, some were crooked or simply did not penetrate. Not very durable.

Good selection and did the job.

The two bigger sizes can be made to work eventually, but not well and by the time you're through once, they're basically spent.The smallest (1mm) is useless. The ends of all sizes are cut square and rely on the diamond coating to do the work; there's simply not enough on the ends to get through glass - the coating on the sides does nothing until there's a hole.Yes, I was working at high speed and yes I used water to cool the grinding.The set is one of those items where you're left wondering why someone bothered to manufacture them at all; what a waste.

We needed a drill that would cut into sea glass without burning up or shattering the glass and these worked perfectly. Make sure that you use a cutting lube to start the hole at an angle and then once you have a depression place the sea glass in water and drill slowly, and lightly, in a perpendicular direction moving the drill in and out to allow the "shavings" to be washed out and the glass to cool. I used a Dremel at 5000 rpm and it cut perfectly. I have drilled to 1 mm holes and the bit is still cutting well.I suggest that you look at vodeaos on line that show you exactly how to do this....first.

So, I wasn’t sure whether to buy these. They had very mixed reviews and did look like they could easily be rubbish from China. Well, guess what, they are from China, but they are certainly not rubbish. I bought the 60 piece set. They came in two nice trays in a sturdy cardboard box. My bits were all straight and fitted my Dremel nicely. They are definitely diamond tipped and not fake. All you need is a little tray of water and some patience.They do not cut, they grind. So I just let the weight of the Dremel do the work, I didn’t push. Having said that, it doesn’t take that long. I was able to center the bits quite accurately by starting at a slight angle and then straightening. I had no problems with them wandering.I cut 3 perfect holes in Sea glass in less than 10 minutes.I’m really happy with these. The price is a steal.