DRILAX50 Pieces Professional Quality Diamond Drill Bit Burr Set Grit 120 Seaglass Rocks Ceramics Glass Porcelain Jewelry Making Lapidary Engraving Fits Rotary Tools 1/8 Inch Shank Storage Case 50

these are very good for shaping wet rock the plainer the better. thank you to the seller.

I'm not a professional, this my first time engraving in marble. These bits worked awesome especially for the price if are looking for some good quality bits at a good price I highly recommend them.

As I always start with my reviews, I purchased this product with my own hard-earned duckets because I needed some larger grinding pieces for my power wood carving. I didn't receive this as a promotion or for free... (which sucks because I'd totally take either and still write my honest opinion).Anyway, here's what I got: 50 very nicely machined grinding burrs with only a few caveots.1) There were a few of the pieces that were slightly askew from 90deg of the shaft. What this means is that they induce a slight wobble when in the rotary tool and therefore do not keep perfectly flat when using these to grind. I found this mainly in 2 of the larger squared thick circular pieces (on the left hand side of the description picture) and two of the smaller rounded edged ones. I also found that two of the sphere burrs were almost devoid of diamond dust, which for any kind of engraving (even wood) becomes a problem.So what happened??: I contacted the seller and they made everything correct nearly immediately.... problems solved.Do I recommend this product? YesWhy, because if you look there are like only 2 sellers that seem to supply this product on the 'Zon and I really like this one.... They've got my return business!Hope that helps anyone on the fence. If you're using this for wood power-carving, I would also encourage you to look for a set of 60-grit bits.... they power through soft woods for great detailing.Cheers,-A

I use these dry, light pressure with my Sioux pneumatic pencil grinder for engraving glass and they work perfectly. I have personalized over 8 espresso glasses and votive candles and still have not thrown any in the trash. High speed and light pressure is the key. Very easy to get custom design and depth with all the unique shapes. Perfect for what I needed. Next usage will be for making a customized stone for the new fad of placing themed stones around town for others to find in public places and be encouraged or inspired.

Used these on turquoise and opal and expected them to work, and they did. Then I used them on jadeite and some other hard stones and was pleased with how well they worked.