1.SEAMLESS steel tube, 2. Production based on DIN2391, EN10305-1, EN10305-3 , 3. High precision on the tolerance of tube ... in wooden cases.Delivery: Within 30 days.1.steel tube2. Production based on DIN2391, EN10305-1, EN10305-3.3. High precision on the ... can be traced in the record.Standard: DIN2391, EN10305-1, EN10305-3.Steel grade: ST35, ST37, ST45, ST52, E235, E355.Tube OD ...