Features : Powerful speed setting + ventilation: Up to 30000 rpm speed that makes your artwork DIY creation a quite easy thing while the vent holes on the body effectively dissipate the heat released when the power rotary tool is running extending battery life for a long-term and safe use. Recessed power button design: With the grooves power button design you no longer have to worry about the rotary tool being stopped due to accidental touches on the switch all the engraving/polishing work is done with nonstop. Great for DIY and professionals alike Precise control for multiple uses: Whenever you are thinking of: engraving sharpening grinding polishing or sanding you will find this power rotary set a must-have for your handy & light artwork creation with optimum precision and control. It is suitable for wood plastic tile glass stone metals etc Overcharge protection: And built-in overcharge protection it is still well protected even you forget to take it off from your wall outlets when it is fully charged. Tips: Not for heavy duty projects. Check the collet size before you put the correct head on Specification : Material: plastic+metal Input power: 24W No-load speed: 30000 (rpm) Grinding head diameter: 3 (mm) includes: 1 x Mini Small Electric Drill Set "