30 Pack 1mm Diamond Drill Bit for Dremel Craftsman Rotary Tool 1/8" Shanks Jewelry Beach Sea Glass Shells Gemstones Lapidary 30pcs.

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.

Best diamond drills I've ever used. I've tried other suppliers and their drills don't hold up and only a few will bottom cut at all. Oudtinx 30 pack are the best I've ever used. I will buy them again. Fast shipping and just a wonderful drill. I drill Obsidian, Agate, and Jade. Mohs scale of 6.0 - 7.5 hardness.

I must be using them wrong as I was only able to drill one hole through glass!

These Dremel tips work great for drilling into glass bottles for making custom water pipes. The thin tips are perfect for the initial holes for the stem and carb. The larger ones are good for enlarging and angling the hole for the stem to ensure the stem will be deeply submerged below the water level. Always remember to wear safety goggles and drill the glass under running water to keep it from cracking.

Not as good quality as I thought. You get what you pay for. Cause it was cheap

I have purchased these a number of times and they’ve been decent quality for the money. This last set I order is horrible, breaking with normal use. I’m not even able to get through one stone without them breaking… they seem to have uneven Diamond coating on the tops which may be the issue.

Worked great for drilling in my windshield to prevent crack from spreading

I was trying to save some cash so I bought these & boy was I disappointed. I have bought cheap bits plenty of times but these take the cake! If you use these for anything with aluminum or metal the diamond grit will literally be non-existent within a minute, if that! I barely have accomplished my goals with these but blew through almost every bit in these cases! Literally smooth metal is all that’s left but the shape of the bit is still obvious. Meaning the outer edge of the bits are covered in diamond dust, then as soon as you touch the surface of your job, the dust gets blown right off these bits! It’s so frustrating throwing away a brand new bit after one to two minutes of use! Do not buy! You get what you pay for with these 100%! I’ve bought more expensive bits that lasted 100x longer than the entire set of bits here! Now I even wanted to see just how bad these bits were & I used a couple against standard wood that you’d use on the frame of a home in the USA, & guess what happened, absolutely nothing! The bits became smooth shells of themselves! It dug into the wood for a few minutes then as expected, became as smooth as a babies butt! Now the pic shows what I am getting at! The pointy bit is a pic taken after one minute at lowest speed on my rotary tool which is next to a brand new bit from the same set. You can clearly see that the pointy bit is cleaned dry of diamond dust as the round one still is crusted in dust. This isn’t an isolated incident either since I have blown through 30 bits that are still holding their shape but the diamond dust is gone!? But as pegs for wood work, they panned out nicely! That was the extra star! Stay away! Pay the extra couple bucks for another product & know you did the right thing here!

used for drilling into sea glass and stone

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.

There is no grit on the tips of these so they will not drill anything. They might work for grinding on the side.

Work good

The bits were as advertised, but 3 broke fairly quickly. I hope the others last longer