Features:Multi-function, charging and plug-in dual purpose grinding machine, high efficiency.2 types of Power Mode - Large capacity battery supply and charging power Universal Chuck - 0.5-3.2mm bit are suitable for any handle diameter of drill bit, greatly improve concentricity.Widely use in carving, punching of wood, jade, agate, jadeite, metal, plastic, etc.Motor torques, long service life, power saving and quiet, imported machine bearing, can effectively improve the accuracy.The body material is made of aviation grade aluminum alloy, which is comfortable to the handle.Specification:Item Type: Electric GrinderMaterial: Aluminium AlloyRotate Speeds: 18,000 rpmBattery Type: battery(included)Chuck Clamping Range: 0.5-3.2mmCharging Voltage: 110-250VBattery Charging Voltage: 100-240VPower : EU Plug, US PlugSize: Approx. 20 x 20 x 2.6cm / 7.9 x 7.9 x 1inchWeight: Approx. 623gPackage list:1 x Electric Grinder Pen2 x 18650 lithiumes battery1 x Charger1 x Adapter1 x Set of Grinding Head Kit1 x Manual