What’re its key Features? (1) 0-20,000 RPM continuously variable speed switching. (2) Forward /reverse directions, pause 2 seconds to protect the motor. It is also suitable for left-hand. (3) Low heat, low noise, low vibration, and portable compact. You can easily use the nail drill and change the nail drill bit. (4) Designed with 6 kinds of metal bits (also works with all kinds of 3/32” shank bits) and 6 sanding bands.