... 16,40/16,40/16S,40/20,52/26 DingRun High Quality Self-drilling Anchor Bolt R51N1)Business Type: Manufacture and ... capability. The products focus on round and profiled cold-rolled precision steel tubes, machinery spare parts. Our manufacturing range rates ... products have the characteristics of small-sized, heavy-wall thickness, high precision, inner or outer special shaped profiles. They are widely ...