We are a professional producer of square and rectangular hollow sections. Our products are mainly used in construction, shipbuilding, sun seeker, cranes, machinery making, auto parts, airport building etc. Our brief product introduction is under below: 1. Square tube: OD:30mm*30mm-500mm*500mm. Wall Thickness: 3mm-40mm 2. Rectangular tube: OD:20mm*40mm-400mm*600mm. Wall Thickness: 3mm-40mm 3. Structural steel pipe: JCOE Large diameter submerged arc welding tube: 325mm-1420mm Wall Thickness: 10mm-60mm If you are interested in our products, please feel free to contact me.