Oudtinx 30 pcs Set 10 pcs. 1mm 10pcs. 2mm 10 pcs. 3mm Diamond Drill Bit Cylindrical Burr Kit Jewelry Beach Sea Glass Shells Gemstones Lapidary 30pcs. 1 mm 2 mm 3mm (1/8")

used for drilling into sea glass and stone

I needed to drill holes in some shark teeth...like most normal folks do on a daily basis, of course. In particular, I wanted small holes just large enough for wax thread. So, I found these bits and thought I'd give them a shot. I had no illusions that these would be heavy duty for the price and just hoped that a set of thirty bits would be enough to drill 14 holes. Well, I have to say that I'm impressed. Not only did they work...But, I drilled all 14 holes in fossil shark teeth using just one bit. So, after reading all the other reviews, this was far better performance than I'd expected. Here's how I did it. 1. I found a small round tin with 2" high walls to use to hold the water and base for drilling. 2. I packed some Plasticine modeling clay into the bottom to act as a grip to hold the tooth. 3. I embedded the tooth into the clay and put enough water to cover the tooth by about a half inch. 4. I put the bit in my Dremel and set it to one of the lowest speeds. This is important because I think a lot of people are running these too fast and burning the grit off. 5. I slowly drilled into the tooth and frequently backed out to allow the filings to wash out of the hole and to cool the bit. I think it took less than an hour to drill 14 holes through shark teeth around 1/8 to 3/16" thick. That is the pro...definitely worth the money. The downside - Don't expect all the bits to be drill worthy. I mean, if you are drilling any sort of precision holes, only half of the bit tips are true enough for accuracy. The rest are fine for grinding edges or maybe enlarging holes. Some are slightly bent and some are varying diameters...just not precision manufacture. So, don't expect anything amazing for ten bucks. But, I'd definitely recommend them.

First as far as drillability it is not designed for anything too hard as far as stones I have not tried it on anything else but I drilled underwater low RPM and two bits later I still haven't made maybe a 16th into the Rock that was 20 minutes of drilling so you might try them for sea glass or something that a lot lighter than any stone at all

My daughter wanted to make a necklace for my wife for Christmas, and she handed me a polished small stone. I've never put a tiny hole in a stone before so I bought these, they started ok, but I broke the first 3 bits I used them gave up. Something thin? Go for it. The stone I was trying to drill was about 3/4 inch thick and that want going to happen.

Ne sont pas suffisamment solide pour la pierre ,piètre qualité