Features：- 100% brand new and high quality- Also 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 high quality and smoothness and can be all sorts of high-precision shape- Safe， reliable and convenient to use- Long life: over 200 times than the wheel- HRA processing hardness: 80- Burs diameter: 2.35mmPackage list：10 different types each pack