SJ-A6 plastic packaged with the unit, with Huaxing SJ-A1-the A5 plastic package with all the features of the unit, traction part of the major manufacturers of the popular "five-roller traction, variable speed relative to the framework, gear transmission, further improve the stability of the machine to improve the life of the machine, to overcome the chain of transmission of vibration, speed instability is like, at the same time five roller traction, to further improve the package with straight. 
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