Stepless Speed Change: 30,000RPM for maximum strength and speed, power supply for a wide range of speed control, low noise, low heat, low vibration. Rotation Direction Switch:Flexible forward and reverse direction switch, great for both right or left hand use.Quick switching, convenient and time-saving. Twist Lock Chunk System:Quick change of the drill head, without any auxiliary tool, rotary operation is more safe, reliable and high-effiency. Multi-function:The nail drill machine is compact in design and small in footprint. It supports all kinds of nail art, such as grinding , cutting , carving , polishing and so on. Comfortable Grip:The lightweight handle eliminates pressure on the wrists and forearms, and also has a ventilation design that reduces heat. Suitable for 3/32" drill bits.