Features: High strength body shell and non-slip handle, strong structure, durable in use. USB charging which can be charged by computer or charging treasure, get rid of the shackles of power cord. And it can be used while charging, which is very convenient. The clamping is stable and not easy to loose off. The clamping core can be replaced to meet the installation requirements of various accessories. The clamping range is 1.0-3.0mm. The motor adopts full copper core wire, with low noise, sufficient power, even rotation speed and high stability. Can be used for grinding, polishing, cutting, drilling, etc. Specification:Material: Aluminum alloyBit specification: 1/1.5/2/2.5/3mm (2pcs for each specification)Chuck specification: 1.0-3.0mmSpecification of copper chuck: 1.0mm, 1.8mm, 2.1mm, 2.8mm, 3.0mmPower type: plug - in power supplyPower supply voltage: computer output /110/220VPackage List:1 x Electric Grinder5 x Copper Chuck1 x Small Wrench1 x Power Cord10 x Drill Bits (1/1.5/2/2.5/3mm)