... 2)Amplitude:45UM 3)Stroke:20000-30000HZ/secon RTW1400 Mini Ultrasonic Grinding MachineTechnical parameters:1.Power Supply:AC110V/220V2 ... stick(10pcs),copper plate(10pcs),amplitude pole(5pcs),fastering frame(1pcs),oper spanner(1pcs),hexagon spanner(1pcs),power cord( ... 1pcs),spark line(1pcs) and so onWorking principle:YUETAI Mini Ultrasonic Grinding Machines have the function of power automation ...