[Features] ● The power supply uses a dedicated inverter power supply (FKC-400F) that provides a high frequency of 400Hz. ●Soft start/soft stop reduces the impact of starting and stopping. Grinding efficiency is improved with a light pressing force. ●Whetstones with a peripheral speed of 72m/S (4300m/min) can be used. ●Use an output cable (10m or 20m) when working.