Features:
      The Mini Punch Grinder can process from dia. 0.5mm to 10mm. If the diameter of workpiece is over than 6mm, please use the Punch Grinder. Right
pressure must be put on the screw to avoid Overpressure.Easy operation and high precision make it to be thebest grinding tool for small workpiece.the material of Outer ring of the Rollers: Tungsten Steel,the lifetime is over 10 times of the normal steel. The accuracy: 0.004mm