... 1,Easy to use dialing speed control,2,Forward and reverse operation swith,3,Up to 18000RPM,4, Extremely ... 1,Press the Nail art polishing drill machine funtion switch on the right to HAND for manual control , ... speed will be acceleerated,and loose the foot,the speed will decrease(foot switch is optional)4,The ... the grinding head to the minimum before turning off and switch the main power source to O .3,After ...