... . material: cast steel or cast iron 2. constitute: two wheels, one axle, four bearings, and other parts.3. loading ... , 762mm, 900mm, and etc.5. the type of the wheels: hollow wheel sets and solid wheel sets.6.the diameter ... of the wheels: 300mm, 350mm, 400mm, 450mm7.the material of the axle ... the client.Welcome your inquiry! Mining Car Wheel Assembly from Factory