Review (2/5): Best for personal use, not professional. Too hot to hold.
Definitely not 40k rpm. More like 30K . Slower than my previous 35k belle e-file.
Gets very hot on the tip, too hot to hold after 2 clients, burns the tip of my fingers. I do about 7 people a day.my fingers and thumb are burned, had to finish my day with it. Now looking for a new drill.
This is best for personal use, not professional use.