Features: brand new and high quality This grinding machine is mainly used to make crystal nails and polish the surface nails or nail edges.And soft 3D model surface .High Speed grinding, equipped with 4-speed adjustable from 3000-20000. If you are grinding hard objects, we suggest that you buy a powerful grinding machine. Package includes 6 variable sanding heads and sanding tools. This machine may not be suitable for use with hard tools Specifications: Item: Mini Model Electric Sander for 3D Printing Material: ABS Speed:3000-20000 Adjustable Power: 100-240V 50-60Hz Charging: USB Color: Black / White / Blue Size: 16x2.4cm/6.3x0.94in Package Includes: 1 PC x Mini Electric Sander 6 PCS x Sanding Heads 1 PC x USB Cable note: Please allow +/- 1-3cm error due to manual measurement，Thanks for your understanding. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object.