1.Cast iron case worm gear box. 2.Hight quality. 3.Stable transmission with low noise. 4.reliable. Worm gear reducer characteristic ... close movement, is sliding and rolling combination, its characteristic with stable and small vibration, low noise, small impact.2 ... intubines,shaft liners and axletrees,goog resistance to wear,with precision in dimensions,low noise,advanced centric running castings. ...