Package Included: 1 Set of 10 Tungsten Carbide BurrsFeatures: Can grind marble， jade and other non-metallic materials Petiolate can basically replace the small wheel， there is no dust pollution Grinding efficiency is increased to 10 times better than manual files and petiolate wheels Processing is smoothness and can be all sorts of precision shape Safe， reliable and convenient to use Long life: over 200 times than the wheel HRA processing hardness: 80 Shank Diameter: about 3mm/ 0.12" Total Length: about 50mm/ 1.97" 10 pcs Tungsten Carbide Burrs in a case