mine car hollow wheelsl 1. material: cast steel, cast iron,45# 2. high loading capacity: 1-30tons 3. wheel gauge: 600,etc Mine car wheel sets factory.1. material: cast steel or cast iron 2. constitute: two wheels, one axle, four bearings, and other parts.3. loading capacity: 1-25tons, each one is ok.4. wheel sets gauge: 600mm, 762mm, 900mm, and etc.5. the type of the wheels: hollow wheel sets and ...