1high torque for low speed 2 good drill capacity 3 heavy ... and reasonable speed range with a few steps, high torque for low speed, it is suitable for small hole diameter ... can be fixed firmly. The frame is rigid with high stability in high speed drilling.7. It is equipped with sufficient ... min)80,148,212,308Positive (high speed, r/min)247,456,650,945reverse (r/min)66,201Max. torque:3.2kN.mMax. stroke ...