1,manufacturer 2,competitive price 3,good quality and quick delivery 4,the third party inspection SGS Name: pre galvanzied square and rectangular steel structure pipeStandard: BS1139, BS EN39, BS EN10296, BS EN10219-2006; ASTM A500; JIS G3444-2006, JIS G3445-2006Material: Q195, Q215, Q235, Q345SIZE: