1.SEAMLESS steel tube, 2. Production based on DIN2391, EN10305-1, EN10305-3 , 3. High precision on the tolerance of tube ... grade: ST35, ST37, ST45, ST52, E235, E355.Tube OD: 5-80mmTube WT: 1.5-8mmCondition: BK, BKW, BKS, NBK, GBK.Management standard: ISO9001 ... , and reinforced wooden case packing for sea transportation.EN10204/3.1 mill test certificate is sent together with goods. EN 10305 ...