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L. Stevens
August 29, 2025
Easy fit
docFL
July 28, 2025
Great value, solid product
IdoArt
July 16, 2025
I was able to drill holes into my plume agate slabs using these drills (see sample cabochon.) I drilled the hole directly into the flat slab, and then cut out the cabochon and shaped and finished it. It pretty much took one to two drill bits to get through about a quarter inch slab, but that is still much cheaper than the $ 15 my local rock shop charges to drill a hole into a pendant for me. Starting the hole was a bit tricky as the bit kept sliding, but once it bit into the rock, it drilled through the rock just fine. I drilled with the piece submerged in water.
angela asbury
July 13, 2025
EASY TO USE
Joseph Michael Cardon
June 28, 2025
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.
L. M. hummel
June 16, 2025
Great services and on time but just cheap made bits not amazons fault !
Noneyabiznas
May 30, 2025
My husband loves these. We collect beautiful rocks around our mountains so he’s started to make some into jewelry for me. These are sturdy and hold up well. I’d recommend.
Kallie S
March 14, 2025
Garbage. First tip broke in half. Second one melted. Do not buy.
Carole tousignant
February 12, 2025
Pierre et verre
Luis Perez
February 3, 2025
Calidad de acuerdo al precio
Pongi
February 3, 2025
Stabile Bohrer die gut bohren.
Daisymoo
January 21, 2025
Great. Drilled through my sea glass wonderfully. These are 1mm, so obviously not much diamon on the ends and you may have to use more than one for the job. Very happy with them.
Andrew Britsch
January 18, 2025
All as ordered
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