... , 3. High precision on the tolerance of tube size. Packaging detail: PP/PE/PVC paper wrapped ... and outside surface. We strictly execute precision tube production standard, each production stage can be ... grade: ST35, ST37, ST45, ST52, E235, E355.Tube OD: 5-80mmTube WT: 1.5-8mmCondition: BK, ... oil for anti-rust.Hexagonal bundled, and reinforced wooden case packing for sea transportation.EN10204/3 ...