... operation swith, 3,Up to 25000RPM, 4, Extremely quiet and smooth · The zs-301 electric nail drill is factory manufactured ... absorption of shock, Extremely quiet and smooth - No Vibration.· Forward and reverse Operation switch.· Over voltage and over current protection intruction in ... 25000 RPM1,Easy to use dialing speed control,2,Forward and reverse operation swith,3,Up to 25000RPM,4, Extremely quiet ...