... .size:108mmX4mm,159x5mm,630mmX8mm,720mmX8mm,920mmX10mm; 2. ISO, API Certification;3. per piece: about 98.50$ CS PIPESTANDARDSTEEL GRADEAPPLICATIONAPPLICATIONJ55,K55,N80 ... , threaded flanges, socket welding flanges, ling flanges, plate flanges seamless carbon steel pipe