Being small and battery powered, I didn't expect much from this rotary tool, but I was still very disappointed. All I had to do was drill a few holes in the Raspberry Pi's plastic case. This tool cannot even drill a small hole (less than 1/8 inch) in thin plastic without getting stuck. The battery died in a few minutes. and the collet loosened further. Don't waste money. Find a tool that works. I am sending this back.