The parameters of precision pipes Specifications: OD:6mm---42mm Wall thickness: 0.8mm---6mm Material: 10#, 20#, 45#, St35, St37.4, St45, St52 Length: 6m----8m Machining code: precision rolling, gas protecting shining anneal Surface treatment: shining without oxygen, phosphating, oxidation, zincification, nickel-plating, ect.