nullDescription Material Aluminum AlloyType Mini GrinderSize 203 25mmPower Source Built in BatteryChargerCable charger power 3 7V 4 2VBattery Charger power 3 7VNo load speed 18000Polishing head diameter 0 5 3 2mmCollet diameter 0 5 3 2mmNet Weight 420gFeatures Double charge methods it is convenience The grinder engraving kit is necessary for DIY carving and grinding This electric carving tool has very mini grinder body convenient to use Suitable for agate nuclear carving wood carving For grinding aluminum plate thin copper board plastic board chipboard printed circuit board epoxy board Perfect electric grinder for cutting engraving milling grinding polishing removing and drilling Package Included 1 X Electric Drill4 X Drill Bit1 X Cable Charger1 XBattery Charger Not included Battery More Details