... /16,40/16,40/16S,40/20,52/26 DingRun High Quality Self-drilling Anchor Bolt R51N1)Business Type: Manufacture and sale2 ... cold-rolled precision steel tubes, machinery spare parts. Our manufacturing range rates within sizes of inner diameter from 10mm to 120mm ... Ra0.4-0.6. The types of steel tubes include 10#, 20#, 35#, 45#, 160Mn, 20GrMo, 35GrMo, 40Gr. The products have ...