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these are pretty good little diamond drill bits and i used them with a regular drill press, at about 3000 rpm. i kept the small stone under water and drilled slowly. the first couple worked like a dream, but 4 of them broke off inside the stones. a couple of them lost their diamond coating. that's why i gave 4 stars instead of 5. i thought for the price, all 20 of them should work the same.
Verified purchase: Yes | Condition: New
Once I got the technique down, these are fantastic for drilling stones for jewelry. Works better if stone has an unpolished surface, of course, and with a very light touch.
Verified purchase: Yes | Condition: New
Thanks so much for the great drill bits
Verified purchase: Yes | Condition: New
good drill bits to a good price
Verified purchase: Yes | Condition: New
These drill bits work great!
Verified purchase: Yes | Condition: New
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