... product:1Materials: carbon steel2Standard: DIN, ANSI, JIS, GB, ISO, or according to client's requirements.3Surface: zinc plated ( plain, black finished, hot ... speed railway and now they are being used. We exported to world markets, such as U.S.A., Canada, Cuba, ... joints 4.Factory view figures:PackagingFactory viewTesting equipmentsWorkshop Welcome your visit! Hardware different types of connector bolt