... ss304 2. Strict quality control 3. ISO9001-2008 galvanized square U shaped bolt (ISO9001-2008) Production Description Haiyan ... description. Can be customized OEM1) material: Carbon steel , galvanized sheet, stainlesssteel 304 2) surface treatment:Zinc , powder coat ... , hot-dip galvanized,blackening, electroplate…3) machining Process:Stamping , turning,tube ...