Nailoops Crystal Super Mandrel

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The original part to which the sanding band is attached is slit, and the spring effect allows the band to be securely attached to the bit. The material is tungsten carbide.
Tungsten carbide has the hardness next to diamond, does not oxidize at room temperature and air, maintains high strength even at high temperatures, and has a low coefficient of thermal expansion, so it is used in high-temperature and high-speed environments. Ideal as raw material.

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