I confess I threw away a few burrs in this set and that was my fault. For some reason it occurred to me one day that those 120 drills were 40 drills, so I started lamenting a piece of quartz with them. I detailing the stone carving after roughening the ridges into the shape I want) they work well. I still think they wear out a bit quickly, but I'm new to stone carving and since it's the dead of winter as I write this, I don't carve stone as often as I do in a basement that's winter is very cold. So it's entirely possible that my lack of experience and lack of articulation is partly or entirely to blame for burrs wearing out so quickly. act. I use a rotary tool with a flexible line attachment and find it harder to articulate the pressure I'm applying to a piece with large burrs. I don't have this problem with milling cutters with a smaller head diameter. But that's just my experience, your mileage may vary, both how you feel the ridges and how long they last. I would like to point out that I do not cut the stone wet; Every once in a while I'll stop and dip the work piece in water, but I don't have the resources at that point to keep the water flowing over the work piece and tool constantly, so this can be another factor as to why burrs form relatively quickly wear me out. I don't know if I'll buy them again when I need more millstones but I'm not happy with them but I don't find them outstanding in any way.
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