... warranty 3.Suitable for the stone stone engraving tools Voltage 220VFrequency 50-60HZPower380WGrinder Diameter 6mmSpeed 22000r/min This product ... is small volume, high speed, low noise, large torque, low gas consumption, lighter stable (shake sway rate ... , tire mould, pen mould, all kinds of high and low voltage electric apparatus, household appliances, mould, plastic shuck switch mould ...