1. The crank wheel is made of high quality tool steel, which effectively reduces the mechanical wear caused by the permanent use.
2. Using the high quality Shanghai Jinling joint motor drive motor, the failure rate of the instrument due to poor electrical components is reduced to a maximum.
3. 600 mesh paper with the most convenient adhesion, neither skidding nor easy to replace.
4. It is more convenient for the instrument to use a small rolling mill.