1.Nail polishing machine for grinding,polishing,soak off,remove deadskin,encraving bow,etc. ... , feel good. Quality motor running no noise. Five grinding drill bits are used interchangeably, and can be both positive and ... bumps, especially handle mouth.4 Do not overload the machine.Grinding head will gradually wear remove the old Wheelhead, ... when not, be sure to turn off the power for safety's sake