Anhui BLKMA heavy industry machinery Co.,ltd. is located in the center of China's machine tool industry, Ma'anShan BoWang District Dongcheng Industrial Park. It is very convenient only takes 20 mins to Nanjing Lukou International airport and connected with Jiangsu, Zhejiang and Shanghai. We are one of the leading manufacture in duct forming machine since 1994. BLKMA company specializes in manufacturing and sales of auto duct production line?Rectangular duct making machine, spiral duct forming machine, round duct making machine and so on. BLKMA®-Square duct, spiral duct, round duct machinery manufacturer, with years of technical accumulation, we have provided high quality products and services for duct processing companies in 100+ countries, and have won wide acclaim in the global market. If you have the needs of duct processing machinery then we will be the best choice.