... /16,40/16,40/16S,40/20,52/26 DingRun High Quality Self-drilling Anchor Bolt R51N1)Business Type: Manufacture and sale2 ... manufacturers, exporters and importers of PRECESION STEEL PIPES & TUBES, based in Jiangyin city, Yangtze River Delta, China. The factory locates alongside ... .6. The types of steel tubes include 10#, 20#, 35#, 45#, 160Mn, 20GrMo, 35GrMo, 40Gr. The products have the characteristics of ...