Description:M drum: variable return pressure design, according to the high speed to adjust the size of the retur....
2020-02-18Description:Straight up: high speed horsepower, low speed torque is not much of an increase. It is suitable for ....
2020-02-18Description:S drum: lift the torque at medium and low speed and start fast. The climb is strong. The voice is lo....
2020-02-18