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I tried to drill sea glass, the 1st 2 bits "melted" and mushroomed. The next 4 attempts broke the pieces and didn't even drill 1/16" deep.
You get what you pay for. It barely left a mark on the glass I was working with. The first one I used went dull in about 20 seconds. The next one I used was on soft metal. Buy Ryobi drills if you want to grind through glass. Very unimpressive.
I only used two of the bits so far. I was able to use them in my Dremel just fine. They worked wonderfully.
This must be done slowly to avoid overheating and possibly fracturing the glass. Since all of the bits still have diamond grit on them, it seems likely that they'll be able to make several more holes before wearing out.NOTE: Tempered glass probably will shatter if drilled. Well, it took about 30 minutes per hole, but more than half of that time was spent pausing to let the glass and bit cool off. This set of 20 bits costs less than one high-quality diamond bit from other sources, and the bits did the job for which they were purchased.Used them to drill two 1/8 inch diameter holes in non-tempered window glass. Used several different bits to change shapes in the hope of making it go faster. This window didn't have a "tempered" logo in the corner and looked normal when viewed through polarized sunglasses. When done, the holes were fine and all of the bits still seemed to have their abrasive surfaces.I've read elsewhere that a high-quality diamond bit will last for perhaps three holes like these, and that it takes about two minutes to make one hole.
These generic diamond point bits work great on my dremel rotary tool and the price for 20 of them is cheaper than buying 1 bit of the dremel brand. I use them for engraving on glass and they have been great.
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