... ) 2) equipment, instrument, building machinery, rolling stock agricultural machinery and various specialized machineries. 2. About product: 1) Types: 60 ... Closure: Plain (Open), Z, ZZ, RS, 2RS, 2ZR, 2Z. 5) Vibration and Noisy level: Z1, Z2, Z3, ZV1, ZV2.ZV3.Z1V1.Z2V2 ... insists on the "quality first, credit first" business ideas and our product specification iswell-founded. We have a good reputation ...