machined by CNC, Own heat-treatment factory ensure good quality durable Material price advantage enough testing equipment 1.Material:stainless steel, Alloy steel 4140,4340,8620,5140,or Carbon steel S45C2.size:can be varied3.plating:Grinding,polishing or black oxide4:the drive shaft are of excellent performance and long using life:high intensity and rigidity. Heat resistant &Distortion resistant5. ...