... 2) equipment, instrument, building machinery, rolling stock agricultural machinery and various specialized machineries. 2. About product: 1) Types: ... ,6400 series,6800 series3) Material: Carbon steel,Stainless steel,Chrome Steel and Bearing steel4) Shield / Closure: Plain (Open), Z, ... reputation in the international market by our perfect service and sufficient supply. 2) We use the highest quality, ...