Flat flange Size: 1/2"-48" Surface: Yellow paint, Black paint,Hot dip Galvd, Zinc, Anti-oil. Material: Q235, A105, 20Mn, ... -24"4. Material Carbon steel5. Surface TreatmentAnti-rust Oil, Transparent/Yellow/Black Anti-rust Paint,Zinc,Hot dipped Galvanized.6. Inspectionfactory in-house ...