... 5Land API5CT certificate1> seamless steel pipe Size: OD 1/8 inch --14 inch, wall thickness 2mm --60mm.2> ERW steel pipe Size: OD89mm ... to 820mm ,wall thickness :4mm to 30mm3> Spiral double-side submerged ... hot rolled thick walled seamless steel pipe:OD102mm to 770mm,wall thickness:15mm to 100mm6> precision cold drawn seamless steel pipe ...