... No Spark Interrupting Has Long Using Life FY20-20B Non-Brush Sander~Adopting Human Engineering's design, comfortable, non-skid ... ~High speed of 35,000RPM, free maintenance of carboloy brush, no sprakle disturbance and have better torque and durabilityControl ... is used for refined polish of medical, decorating and hairdressing nailNo-pale Motor Driving No Machine AbrasionNo Spark Interrupting Has ...