OEM square hollow section

OBM square hollow section orifice is flat, the outer and inner walls of the steel pipe are smooth,also accept oem odm

OEM square hollow section Tianjin YuantaiDerun orifice is flat, the outer and inner walls of the SHS are smooth

ODM square hollow section yuantaiderun(OEM OBM) orifice is flat, the outer and inner walls of the steel pipe are smooth