2. Rotor is without coils and no need to maintain
3.Over-load protection to prevent burning
4.stable rotary speed. speed will not reduse with increasing of rating.
5 without carbon brush, and 3-4 times longer lifetime than normal power tools.
6 only take 3-5 minues to repair if electric circuit board break down.
7 SS soft start, make more stable running.
8 safer with double insulation than similar products
9.Intelligent chip enables to automatically adjust according to rating
10. using an imported cylinder and lubricating grease to achieve better effect, and top-level screws as fastener