... , quenching and tooth grinding processZLYJ112,133,146,173,200,225,250,280,315,330,375,420,450;ZSYJ315,375,395,420 ... , Extrusion, and Blow Molding applications; relevant accessories(such as die head, gearbox, filter screen changer and so on); plastic processing machinery ... products are available, please contact me for further informaiton . single stage gearbox/speed reducer for single-screw extruder