I believe the hydraulic jacking machine the product is not very familiar to consumers, the definition of such products will feel very confused, let your hydraulic jacking machine the mandrel, the mandrel is an important pipe jacking as part of its main role is to power the top tube of the engine through the jack into power, so that the device can have to move forward. Of course the price of hydraulic jacking machine is very favorable, if you need this, you can come to our professional jacking machine manufacturer here to buy, we look forward to your visit, the details please visit: http: // www .yydingguan.com / show7.asp? id = 1216