1. Main functions and characteristics of the description:(1) the hydraulic primary variable speed, can save auxiliary time.all control handle centered laid him in a very convenient place.(2) the main positive &negative, parking (brake), variable speed, gap, a handle to control, easy to use.(3) the spindle box, rocker arm, both inside and outside column adopts hydraulic drive ling xing kuai clamping mechanism, clamping and reliable.
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