we are manufacturer and trader company,these steel pipe we also can supply to you as the competitive price. 1> 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 30mm 3> Spiral double-side submerged-Arc Welded steel pipe, Size : OD 219mm to 2000mm , wall thickness : 5mm to 25.4mm 4> centrifugal casting pipe,size OD 203mm-1000mm,thickness 30mm-150mm. length 1-7 meters please inform me if you have any request,we will supply the best service and competitive price to you. we look forward to cooperation with you.