1.Gear shift, easy operate 2. Wide range of speed 3. Gear driving, gear quench high carrying capacity great torsional moment 1.Gear shift, easy operate2. Wide range of speed3. Gear driving, gear quench high carrying capacity great torsional moment4. The head rotate by the bracket, is much propitious to operate thehole of bevel5. High gear precision, low noiseModelZXD-40Max.Drilling capacity ...