Excellent value for money. I bought them to cut stones. Straight ahead, they carve the rocks beautifully. I'm just dipping into stone carving and this set is good but for me personally. Diamond crowns hold up better. I don't follow them, I didn't know what carbide was and I didn't know the difference between carbide and diamond. I still don't know for sure. I use these in addition to my diamond bits. I would definitely recommend if you are looking for carbide bits.
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