... steel , ss304 2. Strict quality control 3. ISO9001-2008 galvanized square U shaped bolt (ISO9001-2008) Production Description Haiyan Hongtai Metal ... stainlesssteel 304 2) surface treatment:Zinc , powder coat, hot-dip galvanized,blackening, electroplate…3) machining Process:Stamping , turning,tube bending, welding ... 86-0573-86887878 Fax :86-0573-86887758 2013 Hot selling galvanized square U shaped bolt