... 304 2) surface treatment:Zinc , powder coat, hot-dip galvanized,blackening, electroplate…3) machining Process:Stamping , turning,tube bending, welding ... , milling, CNC lathe…4) usage of products: Furniture ... :86-0573-86887878 Fax :86-0573-86887758 2013 Hot selling galvanized square U shaped bolt