Anchor Bar R25,R32N,R32/18.5,R32S,R38N,R38/19, R51L,R51N,T76N,T76S,30/11,30/14, 30/16 ... contributes the engagement in R&D, manufacturing and international trade of precision steel tubes, and has more than 3500 tons’ ... surface roughness Ra0.4-0.6. The types of steel tubes include 10#, 20#, 35#, 45#, 160Mn, 20GrMo, 35GrMo, 40Gr. The ... Win businesses. DingRun High Quality Self-drilling Anchor Bolt R38/19