Specification:Power supply type: plugin power supply;Power supply voltage: 110V/220VInput power: 300WNoload speed: 20000 (rpm)Variable speed mode: infinitely variable speedChuck size: 4mmPower cord length: 1.5 (m)Applicable objects: jade jewelryTips:The complete set includes hoist, rubber hose, inner core, handle, hoist key, foot switchEquipped with a foot switch to control the speed as you like, so you can do whatever you want.The working handle can be replaced with large and small engraving and polishing needles.Widely used as: all kinds of metal grinding, polishing, engraving, cutting, punching, etc.