With 3 adjustable speed level, this multifunctional mini electric grinder can be used for polishing/grinding/drilling ceramic, plastic, iron bar, walnut, wood, etc. Note: *Keep the machine away from the reach of children. *Please allow an 1-3cm error due to manual measurement. *Please read the user manual carefully before use. *Do not apply it on hard materials. *Pull out the plug before maintenance. *Keep the machine clean. *Keep the air vent unimpeded. *Do not use the sharp material to clean the machine. *Do not let liquid enter into the machine to prevent it from rusting. Specifications: Color: Grey Material: ABS Collet Chuck Diameter: 0.5mm / 1mm / 1.5mm / 2.4mm / 3mm / 3.2mm Rated Voltage: 3.7V Rated Power Output: 20W No-load Speed: 15000rpm Current: 5.5A Charge Port: Micro USB Battery Type: Lithium Battery Battery Capacity: 380mAh Charging Voltage: 5V Item Size: 15*2.5cm / 5.9*0.98in Package Size: 21*8*6cm / 8.26*3.14*2.36in Item Weight: 100g / 3.52oz Package Weight: 213g / 7.51oz Packing List: 1 * Polisher 1 * USB Charging Cable 1 * Accessories Kit(6*Collet / 4*Grinding stone bits / 5*Drill bits / 1*Mandrel / 2*Grinding wheel ) 1 * User Manual