Review on Diamond Cylindrical Jewelry Gemstones Lapidary by Nicole Mcleod

I've drilled through the glass long enough to know I need to use a large pot of cold water, the colder the better. I even add ice cubes. I would like to rate these better as they seem to be of decent quality. But out of the thirty tips included in a presentable case, nine tips have such little coverage that there is almost nothing on the tip, I won't even try to use them. The remaining twenty-one are able to get the job done. I can't fault the seller as I believe there was no plating or diamonds in the plating material. I test my bits before I put them in my Dremel tool, just take the bit and scratch it with my thumbnail, if it scratches my nail it should work. I understand that they wear out, some faster than others. But I have some old used ones that were better than the nine in this set. The shipping was great as was the packaging and I will probably buy a few more as I believe in a second chance. And the ones I'm going to use, let's see how they hold up. I like the fact that the coverage increases a little about half an inch. When the tip wears out I use the sides to sand down the edges. For the money spent I am happy with what I got. So I'm better than two out of three, so it's not that bad. Its two thirds + is better.