Stone Carving Set Polishing Rotary Tools Diamond Burr Accessories for Carving/Engraving Stone, Rocks, Jewelry, Glass, Ceramics For Rotary Tools

They work very well, just as expected

New to stone sculpture; this tool with the additional stone bits set has been a delight working with alabaster.

I have only had an issue with one bit, its scoring impregnation somehow came off of the elongated, round end but but none of the others have been an issue.

Diamonds are sparsely embedded in the bit heads. There was blackening from metal friction on the material I worked with. Fine hole drilling is not possible because of how sparsely distributed the diamonds were on the tips of the pointed bits.

After a few months of occasional use, the diamond coating was still fine. However, the 1/8 inch shank seems to have worn a bit to the point that even tightened fully in my dremel tool the bit was still loose. I can tell it's the bit not the collet because I tested several other bits in the tool and those were all still snug, only these diamond bits were loose in the collet.

The bits are affordable and durable. I would give this 5 stars, but one of the grinding bits was barely coated. It even had chunks of coating missing. I did attempt to use the bit in a safe way to see if it would hold up, and the coating chipped away more. I didn't want to have shrapnel shooting out. Had to throw away the bit because it was too dangerous to use. Everything else looks good. If I could change one more thing it would be packaging. All of the bits are stuffed together in a small box. This could damage the bits. Also makes it a pain to get what you need. I don't want to dump out all of the contents every time I need something.

The media could not be loaded.  Great value compared to phenol or nova bits. Container was a bit odd, I have fat fingers, they came in a sectioned blue case with semi transparent lid. The bits were in three sections, hard to get out one, without taking all out first. Not a huge deal. Great product, the whole bit needs to be used, swirling back and forth to evenly wear the bit, or if you only use the end half, the back end will be grittier and less used - but this can also have a good side effect. You can eventually have a fine but, and course bit by doing that. I've had no breakage, or anything. I use them on fire agate which is 2 points less on mohs hardness scale than diamonds. Very pleased. Use a water drip system. Note: some dremel, I have the 4000, require opening the nut fully, without taking it off - to insert some of the bits. I went to buy another quick attach chuck and didnt need too. The guy showed me this trick.

Bits hold up well. Used some on metal, also works, just dulls the bit faster.

I would recommend this item all day long,it's absolutely awesome value for money and does the job of shaping and grinding out designs in .Works well with all the stones I've tried and I must say hardly any wear n tear.So I'm pleased to say your on a win win with this company in China.I have bought smaller item's in the uk and it's not been as reliable or lasting like the Chinese diamond burr tools from this company.

These are ok. You will burn through them pretty quickly. I had some of the diamond coating fall off. It may be a couple defected ones because the rest seem fine. I would buy again because the price is right and they do work well. Just not long lasting.

J'ai gravé sur de interblocs (pavé) et ça fonctionne super bien, les têtes s'usent un peu rapidement mais c'est peut-être normale c'était ma première expérience de gravure avec une tête en pointe de diamant. Mais pour des matériaux durs c'est ce qu'il vous faut.

easy to use

I've purchased these before. They are real work horses. used properly with a lot of water they are awesome for carving anything. I cannot recommend these more highly. Amazon is a great place to buy from.