... . Main character1. With rather high speed and reasonable speed range with a few steps, high torque for low speed, it is suitable for small ... the hole and with only a few operating handles for flexible and reliable operation. Technical Specification: Model of drilling rodDrill ... (r/min)1480(for core drill)Positive (low speed, r/min)80,148,212,308Positive (high speed, r/min)247,456,650,945reverse ...