Without a doubt, whether the metric is net margin or balance sheet, the most profitable construction companies are full service type, providing“design, engineering, project management, construction and procurement” in the heavy industrial and civil sectors. You can contact Changzhou Huari Steel Ball Co., Ltd.,Pingxiang Baitian New Materials Co., Ltd.,Pingxiang Rongjian Environmental Protection Chemical Packing Co., Ltd,Zhanjiang Xin Feng Import and Export Trading Co., Ltd.,Anhui Sinovigo Non-Metallic Material Research Institute via the red button for more infomation.