Drilax Diamond Drill Bits for Stone, Glass, Gemstones & Jewelry – 30-Piece Set (1mm, 2mm, 3mm) – 1/8-Inch Shank Compatible with Dremel Rotary Tools – Lapidary & Crafting Kit

I used these Drilax Diamond Drill Bits to drill small holes in sea glass for a project, and they did a fantastic job. The bits cut cleanly and precisely without cracking or chipping the delicate glass. With a little water for cooling and a steady hand, I was able to get smooth, professional-looking results. Highly recommend for anyone working with glass, shells, or other fragile materials. Great value and performance!

These diamond bits work perfectly to put holes in my ceramic pots that don’t have drainage holes to begin with. Love the variety of sizes it comes with. They work perfectly

Good product for the price. I just wish they lasted longer

Got these for making holes in stained glass with a drill press and dremel, as well as widening existing holes and pockets, as I don't have a ring saw (which are insanely expensive). The blue stuff in the photo is foam, and it's nicely cut to hold the bits securely, although when they came in the mail they were taped down and there was a clear lid. So far they are working fine, you have to make sure to get your spindle speed correct for the best quality cut which just takes practice. I like these style better than the ones that look like a normal twist drill but with diamond coating.

Did the job without a problem. Make sure you use water...

New Review:After more attempts and talking to a professional glass worker I have discovered the trick to drilling through glass with these.Set the drill to the maximum speed possible. A Dremmel tool might not be at the fastest speed setting because it is faster than a drill.Firmly anchor the glass and the drill. The glass should be on a flat wood surface. Lubricate the glass surface with water. Slowly bring the drill to the surface of the glass. Do not apply any pressure. You should be supporting most of the weight of the drill.Initially the water lubricant will turn black. For most diamond drill bits this would mean that they are broken. For this set, it does not mean they are broken. I think the diamonds are coated with a thin layer of titanium or steel that is rubbing off.Replace lubricant every few minutes. After a few replacements it will turn white with drilling instead of black. The drill will drill faster.After you are halfway through, turn the glass over and drill from the other side.It takes about 10-30 minutes to drill through 2mm of glass.This is pretty slow, but it is in my price range so that is what matters in the end.Old Review:I bought these to use to cut FTO coated float glass. The instructions for using diamond drill bits are to use a low rotation speed, and apply only 8-16 pounds of pressure. Using a drill press I was not able to drill through glass using only 16 pounds of pressure, the bit never made it past the surface. When I applied more pressure the diamonds broke off from the surface and acted as a grit to abrade the surface. This did allow the drill to bite into the glass, but it took a very long time (about 15 minutes when higher quality products only take 3) at high pressure and RPM to drill through the glass. Unfortunately this amount of pressure also caused chipping around the edges of the hole and blowout at the other end of the hole, creating an ugly break cone. Each bit could only drill one hole this way before being discarded. Some bits snapped before they drilled through the glass. This product is useless to me.It is possible that these bits could cut into softer stone or sea glass, but for float glass it does not work.

These diamond bits worked great for drilling holes in agate slices! Using my dremel, still took a little time, using water for cooling. I've tried several brands and these are the best. And hold up for several uses.

I had to use 3 of them to drill one hole in 1/8th inch glass. One worked well for 2 holes then stopped making a hole.I still have some left but because the are so unreliable I hesitate to use them. Now shopping for better bits.