This drill toolkit is suitable for maker to do something such as drilling, grinding, cutting, polishing, engraving. The speed can be adjusted to 1 – 6 grade. Features： Please see our wiki for more information about this drill toolkit. Specification： Voltage :220-230V RPM:8000-32500/min Power:180w Chuck range:1.6-3.2mm http://www.seeedstudio.com/wiki/MINIelectricdrillkits-161pcs