60 Pack Diamond Drill Bit 1mm/2mm/3mm Jewelry Beach Sea Glass Shells Gemstones Lapidary,20 pcs 1mm/2mm/3mm.

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I'm giving these five stars because they worked far better for my application than the expensive and almost useless Dremel 664DR diamond bit. I bought them to drill holes in rocks that I had tumbled.Only one bit arrived slightly bent and I was able to straighten it with pliers and still use it. The Dremel brand bit drilled one rock and was toast. For a few dollars more, I got an assortment of sixty bits and they drill much better. I needed 2mm holes, so I prolonged the life of these by drilling 1mm pilot holes, then enlarging them with the 2mm bit. Use them wet to keep them cool, don't force them, and drill a little bit at a time. Yes they break. Yes they wear out. They are disposable items and are cheap to replace. Because of these bits, I was able to complete a bracelet of tumbled stones that the Dremel brand had me ready to give up on.

I really like the versatility of the set of bits. Easy to use and has great variety.

As expected.

I love these for the price. Haven't used much, but when I have they work well. However, keep in mind that you get what you pay for.

Curious why they are selling 60 of these bits for so cheap? It's because 70% of them are bent and the ones that are straight enough to use, burn through their coating so fast, that you'll NEED all 60 of them.Save yourself the trouble, spent the money on a good set from a reputable name and dealer.Don't bother with this cheap dime store stuff.

Different stones have different hardness and will not drill as easily as others, but when drilling the same type of stone, the drill bits should be consistent. With one drill bit I drilled a hole in 6 stones before changing it out and then the replacement drill bit could barely drill through one stone of the same type. When visually inspecting the drill bits, it is obvious that there is more diamond dust on some than others. Some look like there is none and they drill that way too...very inconsistent. About 5 out of 10 of the 3mm bits had to be discarded because they wouldn’t drill into the stone. The 1mm bits are very delicate and break easily.

good buy

I use these for drilling glass and stone. They have lasted for ages and are phenomenal value for money

Don't seem to last long wet or dry for opal.