Double J Hook Surface: Zinc Plated We are specialized in metal parts production, our metal products supply to Benz Truck company and GM automotive,we can make wide range of stamping part, extruding part, machining part and casting part. We can make many kinds of surface treatment, such as galvanizing, hot dip galvanizing, powder coating, Chrome plating, Nickel plating. Dacrotized plating. 1" ...