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Dear Sir or Madam,. Shengdingyuan selects Carbon steel, produced by well-known steel corporations shanghai BAOSTEEL Group. Our products as follows: l seamless carbon cold drawn precision steel tubes for diesel injection lines l Transport oil tube as automobile accessory l Hydraulic tube for hydraulic system l Hydraulic power unit l Fuel injection lines as automobile accessory Advantageous production standard : DIN 2391, ASTM A53, EN10305-1 Steel Grade : ST35,ST37.4,ST45,ST55,CK45,ST52 Specification: we are good at doing outer diameter4mm- 50mm, wall thickness 0.5-8mm, most longest length 12 mm. Especially 4—30mm OD . Sample: we would love to supply quotation and sample for you . Outstanding: Due to complete arts and crafts ,our production have super brightness and cleanness , inner bore is clean as well . we supply super quality tubes for you .