... based on DIN2391, EN10305-1, EN10305-3 , 3. High precision on the tolerance of tube size. Packaging detail: ... on DIN2391, EN10305-1, EN10305-3.3. High precision on the tolerance of tube size.4. Prime ... and outside surface. We strictly execute precision tube production standard, each production stage can be ... ST35, ST37, ST45, ST52, E235, E355.Tube OD: 5-80mmTube WT: 1.5-8mmCondition: BK, BKW, BKS, NBK, ...