I really don't know why there weren't any comments on this topic, but they don't even cut pretty soft stone. They're great for wood if you buy them for that. You should definitely take Rock off this list!
Kutzall Extreme Cylinder Burr - Very Coarse Woodworking Abrasive Tungsten Carbide For Dremel, Foredom, DeWalt & Milwaukee
5 Review
πͺ Kutzall 3.1mm Extreme Taper Shaft
5 Review
Carbide Tungsten Double Rotary Grinder Cutting Tools and Cutting Burrs
4 Review
πͺ TianTac Tungsten Carbide Carving Grinding: Superior Precision and Durability
6 Review