... , airport, railway and industrial engineering, and they offer the following the features: 6.Features:Aesthetic outlook: ... , more than twice of cast iron products. Hot-dip galvanized treatment: Good rust-proof property, ... 23.85, 25, 30, 30.16, 30.3, 34.3, 35, 40,41,60mm. US standard: 1 ... 50,76,100,101.6mm4MaterialQ235,A36,SS3045Surface treatmentBlack, hot dipped galvanising, paint6StandardChina: YB/T 4001.1 ...